Optical laminate for OLED display device

Abstract

The present invention provides an optical laminate used in an OLED display device that does not use a polarizing plate and is not susceptible to interference unevenness and white blur. Provided is an optical laminate used in an OLED display device in which only an optical element having a degree of polarization of 95% or less is laminated on the viewing side of an OLED element. The optical element has at least an antireflection layer and an anti-glare layer. In a reflectance spectrum of the OLED display device, the maximum reflectance in a wavelength range of 380 nm to 455 nm is Rp1, the maximum reflectance in a wavelength range of 460 nm to 530 nm is Rp2, the reflectance of the antireflection layer at a wavelength WL1 of the Rp1 is Rf1, the reflectance of the antireflection layer at a wavelength WL2 of the Rp2 is Rf2, and the reflectance of the antireflection layer at a wavelength WL2 of the Rp1 is Rf2. When the scattering efficiency of the anti-glare layer at the wavelength WL1 is S1 and the scattering efficiency of the anti-glare layer at the wavelength WL2 is S2, the value of (S1 + S2) / {[Rf1 / Rp1] + [Rf2 / Rp2]} is 100 or more.

Description

Technical Field

[0001] The present invention relates to an optical laminate for an OLED display device, and more particularly to an optical laminate for use in an OLED display device that does not use a polarizing plate. Background Art

[0002] Compared to liquid crystal displays (LCDs), OLED (organic light-emitting diode) displays offer advantages in display performance, including high visual recognition, low viewing angle dependence, and fast response speed. Furthermore, OLED displays lack a backlight, facilitating thinning and enabling flexible, bendable, or foldable devices.

[0003] OLED display devices typically include an OLED element in which an anode, an OLED layer including a light-emitting layer, and a cathode are stacked in this order. Because the electrodes (anode or cathode) of OLED elements are made of transparent conductive materials with high refractive indexes, such as ITO, or metal materials with high reflectivity, external light is reflected by the electrodes, resulting in reduced contrast and reflections caused by internal reflections, which can sometimes degrade the display performance of the OLED display device.

[0004] To suppress the adverse effects of external light reflection, a proposal has been made to place a polarizing plate and a circularly polarizing plate, such as a λ / 4 plate, on the viewing side of an OLED display device (e.g., Patent Document 1). Such a circularly polarizing plate also blocks ultraviolet light contained in external light, preventing degradation of the OLED element caused by ultraviolet rays. Furthermore, by utilizing the mechanical properties of the circularly polarizing plate itself, it also absorbs external impact, preventing damage to the OLED display device.

[0005] However, when using a circular polarizer, the light utilization efficiency (i.e., light collection rate) deteriorates due to absorption by the polarizer, resulting in lower brightness. Increasing the luminous intensity of the OLED element to achieve the desired brightness increases power consumption and shortens the lifespan of the OLED element. Furthermore, when the polarizer includes an adhesive layer for bonding, the thickness can reach approximately 0.15 mm, hindering the thinning of the OLED display device. Furthermore, since circular polarizers are expensive, there is also the problem of increased manufacturing costs.

[0006] As an alternative to circular polarizers, the following method has been proposed: for an OLED element, a color filter is arranged on its visual identification side, and the color filter of the same color as the luminous color of the OLED layer is aligned so as to face the OLED element, thereby preventing external light reflection and improving the luminous intensity of the OLED element (for example, Patent Document 2).

[0007] As one form of OLED display device, an OLED display device having a microcavity (also known as multi-reflection interference, optical resonator, or microresonator) structure is known. According to an OLED display device having a microcavity structure, the spectrum of light extracted to the outside becomes steeper and more intense, thereby improving brightness and color purity (for example, Patent Document 3).

[0008] In OLED display devices, various optical elements such as adhesive layers, substrates such as plastic and thin glass, and hard coat layers are laminated to provide functions such as surface protection and flexibility on the viewing side of the OLED element.

[0009] Prior art literature

[0010] Patent Literature

[0011] Patent Document 1: Japanese Patent Application Laid-Open No. 2003-332068

[0012] Patent Document 2: Japanese Patent Application Publication No. 2018-112715

[0013] Patent Document 3: Japanese Patent Application Laid-Open No. 2015-207377 Summary of the Invention

[0014] Problems to be solved by the invention

[0015] As an alternative to circular polarizing plates, a method is used in which a color filter is arranged on the visual recognition side of an OLED element and aligned so that a color filter of the same color as the luminous color of the OLED layer faces the OLED element, thereby preventing external light reflection while improving the luminous intensity of the OLED element. However, due to the regular two-dimensional structure of the color filter, interference unevenness (interference muria) of the reflected light sometimes occurs, thereby impairing the visual recognition of the OLED display device.

[0016] In order to suppress the above-mentioned interference unevenness, laminating an anti-glare layer is effective. However, the anti-glare layer scatters and reflects external light, thereby causing a problem called white blur in which the displayed image appears whitish.

[0017] Therefore, an object of the present invention is to provide an optical laminate for an OLED display device, which is less likely to cause interference unevenness and white blurring in an OLED display device that does not use a polarizing plate.

[0018] Means used to solve problems

[0019] The present inventors have conducted intensive research to achieve the above-mentioned objectives and have discovered that by laminating a specific optical laminate in an OLED display device that does not use a polarizing plate, an OLED display device that is less prone to interference unevenness and white blur and has excellent visual recognition can be provided, thereby completing the present invention.

[0020] That is, the present invention provides an optical laminate for an OLED display device, the optical laminate for an OLED display device being used for an OLED display device in which only an optical element having a polarization degree of 95% or less is laminated on a visual recognition side of an OLED element, wherein the optical element has at least an antireflection layer and an anti-glare layer, and when, in a reflectance spectrum of the OLED display device in a state where the optical laminate for the OLED display device is not laminated, the maximum reflectance within a wavelength range of 380 nm to 455 nm is set to Rp1, and the maximum reflectance within a wavelength range of 460 nm to 530 nm is set to Rp2, the reflectance of the antireflection layer at a wavelength WL1 of Rp1 is set to Rf1, and the reflectance of the antireflection layer at a wavelength WL2 of Rp2 is set to Rf2, and the scattering efficiency of the anti-glare layer at the wavelength WL1 is set to S1, and the scattering efficiency of the anti-glare layer at the wavelength WL2 is set to S2, the value of (S1+S2) / {[Rf1 / Rp1]+[Rf2 / Rp2]} is 100 or greater.

[0021] The water contact angle of the antireflection layer is preferably 100° or greater.

[0022] The water contact angle of the antireflection layer after an eraser test is preferably 90° or greater.

[0023] The antireflection layer is preferably made of an inorganic substance.

[0024] The anti-glare layer preferably has a haze value H' of 5% or more.

[0025] The anti-glare layer preferably has a thickness of 2 μm to 10 μm.

[0026] It is preferred that the anti-glare layer have a base layer and a pressure-sensitive adhesive layer on the side opposite to the visual recognition side.

[0027] The haze value H of the pressure-sensitive adhesive layer is preferably 20% to 90%.

[0028] Effects of the Invention

[0029] An OLED display device in which the optical laminate for an OLED display device of the present invention is laminated on the viewing side of an OLED element is less likely to cause interference unevenness and white blurring and has excellent visibility. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1FIG. 1 is a schematic cross-sectional view showing an embodiment of an OLED display panel according to the present invention.

[0031] Figure 2 This is a schematic cross-sectional view showing one embodiment of an OLED display device in which the optical laminate of the present invention is stacked.

[0032] Figure 3 This is a schematic cross-sectional view showing one embodiment of an OLED display device in which the optical laminate of the present invention is stacked.

[0033] Figure 4 This is a schematic cross-sectional view showing one embodiment of an OLED display device in which the optical laminate of the present invention is stacked.

[0034] Figure 5 This is a schematic cross-sectional view showing one embodiment of an OLED display device in which the optical laminate of the present invention is stacked.

[0035] Figure 6 This is a schematic cross-sectional view showing one embodiment of an OLED display device in which the optical laminate of the present invention is stacked.

[0036] Figure 7 This is a schematic cross-sectional view showing one embodiment of an OLED display device in which the optical laminate of the present invention is stacked. DETAILED DESCRIPTION

[0037] The present invention provides an optical laminate for use in an OLED display device (optical laminate for an OLED display device), wherein only an optical element having a polarization degree of 95% or less is laminated on the viewing side of an OLED element. The optical laminate for an OLED display device of the present invention is sometimes referred to as the "optical laminate of the present invention," an OLED display device using the optical laminate of the present invention is sometimes referred to as the "OLED display device of the present invention," and an optical element constituting the optical laminate of the present invention is sometimes referred to as the "optical element of the present invention."

[0038] The OLED display device of the present invention has an essential structure comprising an OLED display panel including an OLED element in which an anode, an OLED layer including a light-emitting layer, and a cathode are stacked in this order, and the optical laminate of the present invention is stacked on the viewing side of the OLED element. The OLED display panel constituting the OLED display device of the present invention is sometimes referred to as the "OLED display panel of the present invention."

[0039] The OLED display device of the present invention is only stacked with optical elements with a polarization degree of 95% or less on the visual recognition side of the OLED element in the OLED display panel. “Only stacked with optical elements with a polarization degree of 95% or less on the visual recognition side of the OLED element” means that the optical elements on the visual recognition side of the OLED element do not include optical elements with a polarization degree greater than 95%. There are no special restrictions on “optical elements with a polarization degree greater than 95%”, including polarizing plates such as linear polarizing plates, 1 / 4 phase difference plates, 1 / 2 phase difference plates, circular polarizing plates, and reflective polarizing plates. That is, the OLED display device of the present invention is an OLED display device that does not include a polarizing plate on the visual recognition side of the OLED element.

[0040] The polarization degree is determined by the following formula based on the parallel transmittance Tp and the cross transmittance Tc measured using an ultraviolet-visible spectrophotometer and corrected for visibility.

[0041] Polarization degree (%) = {(Tp-Tc) / (Tp+Tc)}1 / 2×100

[0042] The OLED display device of the present invention does not include a polarizing plate on the viewing side of the OLED element. This prevents the polarizing plate from absorbing light emitted from the OLED element, thereby increasing light collection efficiency, saving power, and extending the life of the OLED element. Furthermore, by eliminating the polarizing plate, the device can be thinner and reduce manufacturing costs.

[0043] The optical element of the present invention comprises at least an antireflection layer and an antiglare layer. The optical element of the present invention having an antireflection layer is preferred because it is less likely to cause interference unevenness and white blurring in the OLED display device of the present invention, resulting in excellent visual recognition. Furthermore, the optical laminate of the present invention comprises an antiglare layer, thereby suppressing interference unevenness in the OLED display device of the present invention and providing excellent visual recognition.

[0044] In the optical laminate of the present invention, in the reflectance spectrum of the OLED display device in a state where the optical laminate of the present invention is not laminated, the maximum reflectance in the wavelength range of 380 nm to 455 nm is defined as Rp1, and the maximum reflectance in the wavelength range of 460 nm to 530 nm is defined as Rp2; the reflectance of the antireflection layer at a wavelength WL1 of Rp1 is defined as Rf1, and the reflectance of the antireflection layer at a wavelength WL2 of Rp2 is defined as Rf2; and the scattering efficiency of the antiglare layer at the wavelength WL1 is defined as S1, and the scattering efficiency of the antiglare layer at the wavelength WL2 is defined as S2. The value of (S1+S2) / {[Rf1 / Rp1]+[Rf2 / Rp2]} is 100 or more, preferably 200 or more, and more preferably 300 or more. By having such a configuration, white blurring caused by the OLED display device of the present invention can be suppressed, and excellent visual recognition can be achieved.

[0045] In another embodiment of the OLED display device of the present invention, a color filter is preferably disposed on the visual recognition side of the OLED element, and only the optical element of this embodiment is laminated on the visual recognition side of the color filter. The optical element of this embodiment preferably has at least an adhesive layer, at least one layer of the adhesive layer has light scattering properties, and the distance (d) between the adhesive layer having light scattering properties and the color filter is 700 μm or less. The distance between the adhesive layer having light scattering properties and the color filter is 700 μm or less, which is suitable in the following aspects: even if a light scattering layer is laminated to suppress color shift and interference unevenness caused by the OLED display device of this embodiment, image blur is unlikely to occur, and visual recognition is excellent.

[0046] In another embodiment of the OLED display device of the present invention, the optical element of this embodiment preferably has at least an anti-glare layer. The optical element of this embodiment having an anti-glare layer is suitable for suppressing color shift and interference unevenness caused by the OLED display device of this embodiment, thereby improving visual recognition.

[0047] In another embodiment of the OLED display device of the present invention, the optical element of this embodiment preferably includes at least a glass layer and a resin layer, and the glass layer and the resin layer are bonded together via an adhesive layer. In the optical laminate of this embodiment, bonding the glass layer and the resin layer together via the adhesive layer improves the impact resistance of the OLED display device of this embodiment, and is therefore suitable.

[0048] In another embodiment of the OLED display device of the present invention, the optical element of this embodiment preferably comprises at least a transparent polyimide layer and a hard coat layer. The optical element of this embodiment having a transparent polyimide layer and a hard coat layer improves the impact resistance of the OLED display device of this embodiment, and is therefore suitable. Each component is described below.

[0049] (OLED display panel)

[0050] The OLED display panel used in the OLED display device of the present invention includes an OLED element in which an anode, an OLED layer including a light-emitting layer, and a cathode are stacked in this order as an essential component. The optical laminate of the present invention is stacked on the viewing side of the OLED element of the OLED display panel.

[0051] Hereinafter, an embodiment of an OLED display panel constituting the OLED display device of the present invention will be described with reference to the accompanying drawings. However, the present invention is not limited to this embodiment.

[0052] Figure 1 FIG. 1 is a schematic cross-sectional view showing an embodiment of an OLED display panel according to the present invention.

[0053] like Figure 1 As shown, the OLED display panel 100 includes: a red OLED element 12R in which a transparent electrode 11a, a red OLED layer 10R that emits red light, and a back electrode 11b are stacked in this order; a green OLED element 12G in which a transparent electrode 11a, a green OLED layer 10G that emits green light, and a back electrode 11b are stacked in this order; and a blue OLED element 12B in which a transparent electrode 11a, a blue OLED layer 10B that emits blue light, and a back electrode 11b are stacked in this order. The OLED elements 12R, 12G, and 12B of various colors are sequentially arranged on a substrate 13. A TFT (thin film transistor) layer 14 is formed on the surface of the substrate 13 where the OLED elements are arranged, and is connected to the back electrodes 11b of the OLED elements 12R, 12G, and 12B of various colors.

[0054] exist Figure 1 In the OLED display panel 100, on the visual recognition side of the OLED elements 12R, 12G, and 12B of various colors ( Figure 1 A color filter 15 is provided (in the center, the upper side). The color filter 15 includes a red colored layer 15R, a green colored layer 15G, and a blue colored layer 15B, and a black matrix layer 16 is provided between the colored layers.

[0055] exist Figure 1In the color filter 15 , the red colored layer 15R, the green colored layer 15G, and the blue colored layer 15B are arranged to face the red OLED element 12R, the green OLED element 12G, and the blue OLED element 12B, respectively.

[0056] The transparent electrode 11a is either a cathode or an anode, but is usually a cathode. Transparent conductive materials such as ITO (indium tin oxide), indium oxide, IZO (indium zinc oxide), SnO2, and ZnO are used as the forming material of the transparent electrode 11a.

[0057] The back electrode 11b functions as a counter electrode for the transparent electrode 11a. The back electrode 11b can be either an anode or a cathode, but is typically provided on the substrate 13 as an anode. Examples of materials for forming the back electrode 11b include metals such as gold, silver, and chromium. Therefore, the back electrode 11b can reflect light.

[0058] A bonding layer 17 is provided between the substrate 13 and the color filter 15. The bonding layer 17 is translucent. The bonding layer 17 can be made of any material commonly used in OLED display devices, such as a photosensitive polyimide resin or a thermosetting resin.

[0059] OLED display panel 100 Figure 1 In addition to the structures shown, the OLED display panel may have structures such as a hole injection layer, a hole transport layer, an electron transport layer, a sealing layer, a touch sensor panel, etc. (not shown).

[0060] Figure 1 The OLED display panel is characterized in that a color filter 15 is disposed on each of the OLED elements 12R, 12G, and 12B in a manner opposite to the colored layers 15R, 15G, and 15B of the same color. Figure 1 As shown, white external light W, for example, passes through the red coloring layer 15R, further passes through the transparent electrode 11a and the red OLED layer 10R that emits red light and is reflected at the back electrode 11b, passes through the red OLED layer 10R, the transparent electrode 11a and the red coloring layer 15R again, and then the reflected light G enters the observer's eyes.

[0061] The external light W is absorbed by the red coloring layer 15R, which absorbs green and blue light, so the light intensity is reduced to 1 / 3. In addition, the reflected light G passes through the red coloring layer 15R and the red OLED layer 10R again, thereby causing attenuation. In addition, the reflected light G is red, so it can enhance the red light emitted from the OLED layer 10R. The same is true when the external light W is incident on the green coloring layer 15G and the blue coloring layer 15B, which can enhance the green light and blue light respectively. Therefore, by using color filters in the OLED display panel, even without using a circular polarizer to prevent reflection, the reflection of external light can be greatly suppressed, and the luminous intensity of the OLED element can be improved.

[0062] However, color filters are generally prone to interference unevenness caused by a regular two-dimensional structure. In addition, color filters are prone to reflection at the interface, which reduces the light collection rate of light emitted from the OLED element. In addition, compared with the case of using a circular polarizing plate, color filters have insufficient ultraviolet absorption function, and OLED elements are prone to deterioration over time due to ultraviolet rays contained in external light (i.e., low weather resistance). In addition, compared with the case of using a circular polarizing plate, color filters have insufficient impact absorption function.

[0063] The OLED display panel 100 of this embodiment also has a microcavity structure. Light generated by the OLED layers 10R, 10G, and 10B is emitted to the outside through the transparent electrode 11a. This emitted light consists of two components: "direct light," which is emitted directly from the OLED layers 10R, 10G, and 10B toward the transparent electrode 11a, and "reflected light," which is emitted from the OLED layers 10R, 10G, and 10B toward the back electrode 11b, reflected by the back electrode 11b, and then emitted toward the transparent electrode 11a. Specifically, a first optical path C1 is formed in which a portion of the light emitted from the OLED layers 10R, 10G, and 10B does not travel toward the back electrode 11b but instead travels toward the transparent electrode 11a, passing through the transparent electrode 11a and emitting to the outside. A second optical path C2 is formed in which the remaining portion of the light emitted from the OLED layers 10R, 10G, and 10B travels toward the back electrode 11b, is reflected by the back electrode 11b, and then passes through the OLED layers 10R, 10G, 10B and the transparent electrode 11a and emitting to the outside. The thicknesses of the OLED layers 10R, 10G, and 10B differ so that the interference between the direct light and the reflected light enhances the light components corresponding to each color. Specifically, the thicknesses of the OLED layers 10R, 10G, and 10B are varied so that the optical path lengths between the back electrode (positive electrode) 11b and the transparent electrode (negative electrode) 11a coincide with the peak wavelengths of the EL spectra for each of the red, green, and blue colors, thereby extracting the strongest light from each color. Specifically, the short-wavelength blue OLED layer 10B is designed to be thin, while the long-wavelength red OLED layer 10R is designed to be thick. When light generated in the OLED layer is repeatedly reflected between the positive and negative electrodes, only light with wavelengths that match the optical path length resonates and intensifies, while light with other wavelengths that do not match the optical path length is weakened. This results in a steeper spectrum of light extracted to the outside, with higher intensity, improving brightness and color purity.

[0064] While OLED display panels with a microcavity structure can achieve excellent results such as improved brightness and color purity, their steep spectrum can also lead to a problem of strong viewing angle dependence (narrow viewing angle). Consequently, when viewing an image from an oblique angle, a color shift may occur, causing the color to appear different from the intended color.

[0065] (Optical element of the present invention)

[0066] The optical element of the present invention is an optical element laminated on the viewing side of an OLED display device, and includes at least one layer selected from the group consisting of an adhesive layer, an adhesive layer, a resin layer, a glass layer, a hard coat layer, an antireflection layer, an antiglare layer, an intermediate layer (a compatibilizing layer), an impact-absorbing layer, and an antistatic layer. However, the optical element of the present invention does not include an optical element having a polarization degree greater than 95%, such as a polarizing plate.

[0067] (Adhesive layer)

[0068] The adhesive layer is a layer having adhesiveness at room temperature and adhering to an adherend with light pressure. Even when the adherend affixed to the adhesive layer is peeled off, the adhesive layer maintains practical adhesive strength.

[0069] From the perspective of effectively reducing color shift and interference unevenness in OLED display devices, the adhesive layer constituting the optical element of the present invention (hereinafter sometimes referred to as the "adhesive layer of the present invention") preferably has light scattering properties (a function of scattering light). When the adhesive layer of the present invention has light scattering properties, it preferably contains light scattering fine particles dispersed in the adhesive layer.

[0070] In the case where the OLED display device of the present invention includes a color filter on the visual recognition side and the adhesive layer has light scattering properties, from the perspective of reducing the color shift and interference unevenness of the OLED display device and suppressing the image blur of the OLED display device caused by light scattering, the distance (d) between the adhesive layer with light scattering properties and the color filter is preferably 700 μm or less. From the perspective of suppressing the image blur of the OLED display device caused by light scattering, the distance between the adhesive layer with light scattering properties and the color filter is more preferably 600 μm or less, and further preferably 500 μm or less. It is most preferred that the adhesive layer with light scattering properties is in direct contact with the color filter. The distance between the adhesive layer with light scattering properties and the color filter represents the distance (μm) between the surface of the adhesive layer in the color filter direction and the surface of the adhesive layer in the color filter direction. When other layers are stacked between the adhesive layer with light scattering properties and the color filter, it is equivalent to the thickness (μm) of the other layer (the total in the case of two or more layers).

[0071] The haze value (H) of the adhesive layer of the present invention is not particularly limited. From the perspective of effectively reducing color shift and interference unevenness in OLED display devices, it is preferably 20% or more, more preferably 30% or more, further preferably 40% or more, and particularly preferably 50% or more. In addition, from the perspective of suppressing image blur in OLED display devices and displaying high-definition images, the haze value of the adhesive layer of the present invention is preferably 90% or less, more preferably 80% or less, and even more preferably 70% or less.

[0072] The total light transmittance of the adhesive layer of the present invention is not particularly limited. From the perspective of ensuring the brightness of the OLED display device, it is preferably 60% or higher, more preferably 70% or higher, even more preferably 80% or higher, and particularly preferably 90% or higher. Furthermore, the upper limit of the total light transmittance of the adhesive layer of the present invention is not particularly limited and may be less than 100%, or may be 99.9% or lower, or 99% or lower.

[0073] The haze value and total light transmittance of the adhesive layer of the present invention can be measured by the methods specified in JIS K7136 and JIS K7361, respectively, and can be controlled by the type and thickness of the adhesive layer, and the type and amount of light scattering fine particles described below.

[0074] From the viewpoint of effectively reducing color shift and interference unevenness in OLED display devices, the thickness (T) of the adhesive layer of the present invention is preferably 10 μm to 100 μm, more preferably 15 μm to 90 μm, and even more preferably 20 μm to 80 μm.

[0075] The light scattering particles and the adhesive in the adhesive layer have a suitable refractive index difference, giving light scattering properties to the adhesive layer. When the adhesive layer contains light scattering particles, it is preferred to give scattering properties to light. As light scattering particles, inorganic particles, polymer particles, etc. can be listed. The light scattering particles are preferably polymer particles, and particularly particles consisting of silicone resins (such as the Tospearl series manufactured by Maitu Advanced Materials Japan Co., Ltd.) have excellent dispersibility, stability and a suitable refractive index difference with the adhesive layer to the adhesive layer, and can obtain an adhesive layer with excellent scattering properties showing uniform haze in the plane, which is preferred in terms of reducing the color shift of the OLED display device and the uneven interference. The shape of the light scattering particles can be, for example, a true sphere, a flat shape, or an irregular shape. The light scattering particles can be used alone or in combination with two or more.

[0076] The refractive index (n3) of the light-scattering fine particles is preferably 1.2 to 5, more preferably 1.25 to 4.5, and may be 1.3 to 4 or 1.35 to 3.

[0077] From the perspective of effectively reducing color shift and interference unevenness in OLED display devices, the absolute value of the refractive index difference between the light-scattering fine particles and the binder in the binder layer (the binder layer excluding the light-scattering fine particles) is preferably 0.001 or greater, more preferably 0.01 or greater, even more preferably 0.02 or greater, particularly preferably 0.03 or greater, and can be 0.04 or greater or 0.05 or greater. Furthermore, from the perspective of preventing excessively high haze values, suppressing image blur, and displaying high-definition images, the absolute value of the refractive index difference between the light-scattering fine particles and the binder is preferably 5 or less, more preferably 4 or less, and even more preferably 3 or less.

[0078] The refractive index (n2) of the binder is preferably 1.40 to 1.60, more preferably 1.42 to 1.55, and even more preferably 1.43 to 1.50.

[0079] The adhesive layer of the present invention (particularly when a color filter is disposed on the viewing side of the OLED element and the distance (d) between the adhesive layer of the present invention and the color filter is 700 μm or less) is not particularly limited. However, from the perspective of preventing interfacial reflection and improving the light collection efficiency of light emitted from the OLED element, a high refractive index is preferred. From the perspective of preventing interfacial reflection and improving the light collection efficiency of light emitted from the OLED element, the refractive index of the adhesive layer of the present invention is preferably 1.57 or greater, more preferably 1.575 or greater, even more preferably 1.580 or greater, particularly preferably 1.585 or greater, even more preferably 1.590 or greater, and may also be 1.595 or greater.

[0080] The adhesive constituting the adhesive layer of the present invention is not particularly limited, and examples thereof include acrylic adhesives, rubber adhesives, vinyl alkyl ether adhesives, silicone adhesives, polyester adhesives, polyamide adhesives, urethane adhesives, fluorine-containing adhesives, and epoxy adhesives. Among these, acrylic adhesives are preferred as the adhesive constituting the adhesive layer from the perspectives of transparency, adhesion, weather resistance, cost, and ease of adhesive design. Specifically, the adhesive layer of the present invention is preferably composed of an acrylic adhesive. These adhesives may be used alone or in combination of two or more.

[0081] The acrylic adhesive layer contains an acrylic polymer as a base polymer. The acrylic polymer is a polymer containing an acrylic monomer (a monomer having a (meth)acryloyl group in the molecule) as a monomer component of the polymer. The acrylic polymer is preferably a polymer containing an alkyl (meth)acrylate as a monomer component of the polymer. It should be noted that the acrylic polymers may be used alone or in combination of two or more.

[0082] The pressure-sensitive adhesive layer of the present invention is an acrylic pressure-sensitive adhesive layer containing an acrylic polymer as a base polymer, and is preferably formed from an active energy ray-curable acrylic pressure-sensitive adhesive composition.

[0083] As the adhesive composition (acrylic adhesive composition) forming the above-mentioned acrylic adhesive layer, for example, there can be mentioned: an acrylic adhesive composition having an acrylic polymer as an essential component, or an acrylic adhesive composition having a mixture of monomers (monomers) constituting acrylic polymers (sometimes referred to as a "monomer mixture") or a partial polymer thereof as an essential component. As the former, for example, the so-called solvent-based acrylic adhesive composition can be mentioned. In addition, as the latter, for example, the so-called active energy ray-curable acrylic adhesive composition can be mentioned. The above-mentioned "monomer mixture" refers to a mixture containing monomer components constituting a polymer. In addition, the above-mentioned "partial polymer" is sometimes also referred to as a "prepolymer", which refers to a composition formed by partial polymerization of one or more monomer components among the monomer components in the above-mentioned monomer mixture.

[0084] The acrylic polymer is a polymer composed (formed) of an acrylic monomer as an essential monomer component (monomer component). The acrylic polymer is preferably a polymer composed (formed) of an alkyl (meth)acrylate as an essential monomer component. That is, the acrylic polymer preferably contains an alkyl (meth)acrylate as a structural unit. In this specification, "(meth)acrylic acid" means "acrylic acid" and / or "methacrylic acid" (either or both of "acrylic acid" and "methacrylic acid"), and the same applies to others. It should be noted that the acrylic polymer is composed of one or more monomer components.

[0085] As the aforementioned alkyl (meth)acrylate as an essential monomer component, preferably, there can be mentioned alkyl (meth)acrylates having a linear or branched alkyl group.

[0086] The (meth)acrylate alkyl ester having a linear or branched alkyl group is not particularly limited, and examples thereof include methyl (meth)acrylate, ethyl (meth)acrylate, propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, isobutyl (meth)acrylate, sec-butyl (meth)acrylate, tert-butyl (meth)acrylate, pentyl (meth)acrylate, isopentyl (meth)acrylate, hexyl (meth)acrylate, heptyl (meth)acrylate, octyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, isooctyl (meth)acrylate, nonyl (meth)acrylate, propyl ... tert-butyl (meth)acrylate, tert-butyl (meth)acrylate, tert-butyl (meth)acrylate, tert-butyl (meth)acrylate, tert-butyl (meth)acrylate, tert-butyl (meth)acrylate, tert-butyl (meth)acrylate, tert-butyl (meth)acrylate, tert-butyl (meth)acrylate, tert-butyl (meth)acrylate, tert-butyl (meth)acrylate, tert-butyl (meth)acrylate, tert-butyl (meth)acrylate, tert-butyl (meth)acrylate, ter Alkyl (meth)acrylates having a linear or branched alkyl group with 1 to 20 carbon atoms, such as isononyl (meth)acrylate, decyl (meth)acrylate, isodecyl (meth)acrylate, undecyl (meth)acrylate, dodecyl (meth)acrylate, tridecyl (meth)acrylate, tetradecyl (meth)acrylate, pentadecyl (meth)acrylate, hexadecyl (meth)acrylate, heptadecyl (meth)acrylate, octadecyl (meth)acrylate (stearyl (meth)acrylate), isostearyl (meth)acrylate, nonadecyl (meth)acrylate, and eicosyl (meth)acrylate. Among these, the alkyl (meth)acrylates having a linear or branched alkyl group are preferably those having a linear or branched alkyl group with 4 to 18 carbon atoms, and more preferably 2-ethylhexyl acrylate (2EHA) and isostearyl acrylate (ISTA). These alkyl (meth)acrylates having a linear or branched alkyl group may be used alone or in combination of two or more.

[0087] In the case where the adherend of the adhesive layer is a wiring comprising a metal or metal oxide such as a touch panel, from the viewpoint of obtaining an acrylic adhesive layer with excellent corrosion resistance, the acrylic polymer preferably does not include or substantially does not include an acidic group-containing monomer as a monomer component constituting the polymer, and particularly preferably does not include or substantially does not include a carboxyl group-containing monomer. As acidic group-containing monomers, for example, carboxyl group-containing monomers, sulfonic acid group-containing monomers, phosphoric acid group-containing monomers, etc. can be cited. Specifically, the ratio of the acidic group-containing monomers in all monomer components (100% by weight) constituting the acrylic polymer is 0.05% by weight or less (preferably 0.01% by weight or less), which can be referred to as substantially not containing acidic group-containing monomers.

[0088] The content of the base polymer (particularly the acrylic polymer) in the adhesive layer of the present invention is not particularly limited, but is preferably 50% by weight or more (e.g., 50% by weight to 100% by weight), more preferably 80% by weight or more (e.g., 80% by weight to 100% by weight), and even more preferably 90% by weight or more (e.g., 90% by weight to 100% by weight), relative to 100% by weight of the total weight of the adhesive layer of the present invention.

[0089] (Adhesive layer)

[0090] The adhesive layer is a layer that can bond substances by being sandwiched between adherends. When the adherends bonded with the adhesive layer are peeled off, the adhesive layer does not have practical adhesive strength.

[0091] Various adhesives can be used as adhesives to form the adhesive layer (hereinafter sometimes referred to as the "adhesive layer of the present invention") constituting the optical element of the present invention, including isocyanate adhesives, polyvinyl alcohol adhesives, gelatin adhesives, vinyl latex adhesives, and water-based polyester adhesives. These adhesives are generally used as adhesives comprising aqueous solutions (water-based adhesives) and contain 0.5% to 60% by weight of solids. Among them, polyvinyl alcohol adhesives are preferred, and polyvinyl alcohol adhesives containing acetoacetyl groups are more preferred.

[0092] As the adhesive, in addition to the above, active energy ray curing adhesives such as ultraviolet curing adhesives and electron beam curing adhesives can also be cited. As the active energy ray curing adhesive, for example, (meth)acrylate adhesives can be cited. As the curable component in the (meth)acrylate adhesive, for example, compounds having a (meth)acryloyl group and compounds having a vinyl group can be cited. As the compound having a (meth)acryloyl group, for example, (meth)acrylic acid alkyl esters such as chain alkyl esters having 1 to 20 carbon atoms, alicyclic alkyl (meth)acrylates, and polycyclic alkyl (meth)acrylates; (meth)acrylates containing hydroxyl groups; (meth)acrylates containing epoxy groups such as glycidyl (meth)acrylate, etc. can be cited.

[0093] The application of the above-mentioned adhesive can be performed on either one of the two adherends to be bonded, or on both. After bonding, a drying process can be implemented to form the adhesive layer of the present invention consisting of a coated dried layer. After the above-mentioned drying process, ultraviolet rays or electron beams can be irradiated as needed. The thickness of the adhesive layer of the present invention is not particularly limited. When using a water-based adhesive, etc., it is preferably about 30nm to about 5000nm, more preferably about 100nm to about 1000nm. When using an ultraviolet curing adhesive, an electron beam curing adhesive, etc., it is preferably about 0.1μm to about 100μm, more preferably about 0.5μm to about 10μm.

[0094] (Resin layer)

[0095] The resin layer constituting the optical element of the present invention (hereinafter sometimes referred to as "resin layer of the present invention") is not particularly limited, and examples thereof include plastic films. Examples of raw materials for the plastic film include polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN), cyclic olefin polymers (COP) (e.g., trade name "ARTON" (manufactured by JSR Corporation), trade name "ZEONOR" (manufactured by ZEON Corporation of Japan), acrylic resins such as polymethyl methacrylate (PMMA), polycarbonate (PC), triacetyl cellulose (TAC), polysulfone, polyarylate, polyetheretherketone (PEEK), polyimide (PI), transparent poly Plastic materials such as polyimide (CPI), polyvinyl chloride, polyvinyl acetate, polyethylene, polypropylene, and ethylene-propylene copolymers are preferably polyester resins such as polyethylene terephthalate (PET) and polyethylene naphthalate (PEN) that have excellent dimensional stability and are not easy to shrink, cyclic olefin polymers (COP), polycarbonate (PC), polyetheretherketone (PEEK), and transparent polyimide (CPI). Polyethylene terephthalate (PET) and transparent polyimide (CPI) are more preferred, and transparent polyimide (CPI) with excellent impact resistance is particularly preferred. It should be noted that these plastic materials can be used alone or in combination of two or more. The release liner that is peeled off when using the optical element of the present invention (when pasting) is not included in the "resin layer".

[0096] The thickness of the resin layer of the present invention is not particularly limited, but is preferably 10 μm to 80 μm, for example. It should be noted that the resin layer of the present invention may have any form, whether single-layer or multi-layer. Furthermore, the surface of the resin layer of the present invention may be appropriately subjected to known and conventional surface treatments, such as physical treatments such as corona discharge treatment and plasma treatment, and chemical treatments such as primer treatment.

[0097] (Glass layer)

[0098] The glass layer constituting the optical element of the present invention (hereinafter sometimes referred to as the "glass layer of the present invention") is not particularly limited, and an appropriate glass layer may be employed depending on the intended purpose. Examples of the glass layer of the present invention include soda-lime glass, borate glass, aluminosilicate glass, and quartz glass, based on composition. Furthermore, examples of the glass layer of the present invention include alkali-free glass and low-alkali glass, based on alkali content. The content of alkali metal components (e.g., Na2O, KO, Li2O) in these glasses is preferably 15% by weight or less, and more preferably 10% by weight or less.

[0099] Considering the surface hardness, airtightness, and corrosion resistance of glass, the thickness of the glass layer of the present invention is preferably 20 μm or greater. Furthermore, the glass layer of the present invention preferably has film-like flexibility and bendability. Furthermore, to suppress ghosting and project a clear image, the thickness is preferably 60 μm or less. The thickness of the glass layer of the present invention is more preferably 30 μm or greater and 55 μm or less, and particularly preferably 40 μm or greater and 50 μm or less.

[0100] The method for forming the glass layer of the present invention is not particularly limited, and an appropriate method may be employed depending on the intended purpose. Typically, the glass layer of the present invention can be produced by melting a mixture containing main raw materials such as silica and alumina, a defoaming agent such as Glauber's salt or antimony oxide, and a reducing agent such as carbon at a temperature of approximately 1400°C to 1600°C, forming the mixture into a thin plate, and then cooling the mixture. Examples of methods for forming the glass layer of the present invention include the slot-draw method, the fusion method, and the float method. To thin the glass layer formed into a plate by these methods or to improve its smoothness, chemical polishing using a solvent such as hydrofluoric acid may be performed as needed.

[0101] (Hard Coating)

[0102] The hard coating layer constituting the optical element of the present invention (hereinafter sometimes referred to as the "hard coating layer of the present invention") can be formed from any suitable resin as long as it has sufficient surface hardness, excellent mechanical strength, and excellent light transmittance. Specific examples of resins include thermosetting resins, thermoplastic resins, ultraviolet curing resins, electron beam curing resins, and two-component mixed resins. Ultraviolet curing resins are preferred. This is because the hard coating layer can be formed with simple operation and high efficiency.

[0103] Specific examples of UV-curable resins include polyesters, acrylics, urethanes, amides, silicones, and epoxies. UV-curable resins include UV-curable monomers, oligomers, and polymers. Preferred UV-curable resins include resin compositions containing acrylic monomers or oligomers having preferably two or more, and more preferably three to six, UV-polymerizable functional groups. Typically, UV-curable resins contain a photopolymerization initiator.

[0104] The hard coat of the present invention can be formed by any appropriate method.For example, the hard coat of the present invention can be formed by applying a hard coat forming resin composition on a substrate (comprising the above-mentioned resin layer, glass layer) and drying it, and irradiating the dried coating film with ultraviolet light to solidify it and form it.

[0105] The thickness of the hard coat layer of the present invention is, for example, 2 μm to 20 μm, preferably 4 μm to 15 μm, and more preferably 4 μm to 10 μm.

[0106] (Anti-reflection layer)

[0107] The antireflection layer constituting the optical element of the present invention (hereinafter sometimes referred to as the "antireflection layer of the present invention") is preferably composed of an inorganic substance. Examples of the inorganic substance include those exemplified and described as materials constituting the high refractive index layer, low refractive index layer, and medium refractive index layer described below.

[0108] The antireflection layer of the present invention may have any appropriate structure, for example: (i) a single layer having an optical film thickness of 120 nm to 140 nm and a low refractive index layer having a refractive index of 1.35 to 1.55, (ii) a laminate having a medium refractive index layer, a high refractive index layer, and a low refractive index layer in this order, and (iii) a laminate having a plurality of layers alternating high refractive index layers and low refractive index layers.

[0109] Examples of materials that can form the low-refractive-index layer include silicon oxide (SiO 2 ) and magnesium fluoride (MgF 2 ). The refractive index of the low-refractive-index layer is typically about 1.35 to 1.55.

[0110] The material of the low refractive index layer can be a cured product of a curable fluorine-containing resin. The curable fluorine-containing resin, for example, has a structural unit derived from a fluorine-containing monomer and a structural unit derived from a crosslinkable monomer. As specific examples of fluorine-containing monomers, for example, there can be listed: fluoroolefins (vinyl fluoride, vinylidene fluoride, tetrafluoroethylene, hexafluoroethylene, hexafluoropropylene, perfluoro-2,2-dimethyl-1,3-dioxole, etc.), (meth)acrylate derivatives with partially or completely fluorinated alkyl groups (Viscoat 6FM (manufactured by Osaka Organic Chemical Co., Ltd.), M-2020 (manufactured by Daikin Corporation), etc.), completely or partially fluorinated vinyl ethers, etc. As crosslinkable monomers, for example, there can be listed: (meth)acrylate monomers having crosslinkable functional groups in the molecule such as glycidyl methacrylate; (meth)acrylate monomers having functional groups such as carboxyl, hydroxyl, amino, and sulfonic acid groups ((meth)acrylic acid, hydroxymethyl (meth)acrylate, hydroxyalkyl (meth)acrylate, allyl (meth)acrylate, etc.). The fluorine-containing resin may have a structural unit derived from a monomer other than the above-mentioned compounds (for example, an olefin-based monomer, a (meth)acrylate-based monomer, a styrene-based monomer).

[0111] Examples of materials that can form the high refractive index layer include titanium oxide (TiO2), niobium oxide (Nb2O3 or Nb2O5), tin-doped indium oxide (ITO), antimony-doped tin oxide (ATO), and ZrO2-TiO2. The refractive index of the high refractive index layer is typically about 1.60 to 2.40.

[0112] Examples of materials capable of forming the medium refractive index layer include titanium oxide (TiO2), a mixture of a material capable of forming a low refractive index layer and a material capable of forming a high refractive index layer (e.g., a mixture of titanium oxide and silicon oxide). The refractive index of the medium refractive index layer is typically about 1.50 to about 1.85. The thicknesses of the low refractive index layer, the medium refractive index layer, and the high refractive index layer can be set to achieve an appropriate optical film thickness corresponding to the layer structure of the antireflection layer, the desired antireflection performance, etc.

[0113] The anti-reflection layer of the present invention can be formed by a dry process (e.g., sputtering), a wet process (e.g., coating), or a combination of dry and wet processes. Specific examples of dry processes include PVD (physical vapor deposition) and CVD (chemical vapor deposition). PVD methods include vacuum evaporation, reactive evaporation, ion beam assisted deposition, sputtering, and ion plating. CVD methods include plasma CVD.

[0114] As a specific example of a wet process, for example, a coating liquid for forming an anti-reflection layer can be applied to form a coating film, and the coating film is cured to form the anti-reflection layer. As a coating method, for example, a coating method such as a jet coating method, a die coating method, a spin coating method, a spray coating method, a gravure coating method, a roller coating method, or a rod coating method can be used. Preferably, the coating film is dried before curing. The drying method can be, for example, natural drying, air drying with a blower, heat drying, or a method obtained by combining these. The curing method of the coating film is not particularly limited, but ultraviolet curing is preferred.

[0115] The thickness of the anti-reflection layer of the present invention is, for example, about 20 nm to about 300 nm.

[0116] From the viewpoint of antifouling properties, the water contact angle of the antireflection layer of the present invention is preferably 90° or greater, more preferably 95° or greater, further preferably 100° or greater, and particularly preferably 105° or greater.

[0117] The water contact angle of the antireflection layer of the present invention is measured according to JIS R3257, and can be regulated by the kind of the component that constitutes the antireflection layer etc. In addition, the water contact angle of the antireflection layer of the present invention preferably after the following eraser test is within the above-mentioned range. By laminating the antireflection layer having a water contact angle after the eraser test within these ranges on the visual recognition side, particularly the outermost surface, of the OLED display device, even after the OLED display device is rubbed by a hand or cloth, excellent antifouling properties can be maintained.

[0118] Eraser Test

[0119] An eraser for evaluating wear resistance manufactured by Minoan, Model 4004005007, was cut into 7 mm pieces and rubbed against the surface of the hard coating layer 6000 times in a reciprocating motion under conditions of a load of 1 kg and a moving speed of 32 mm / sec.

[0120] (Anti-glare layer)

[0121] As the antiglare layer constituting the optical element of the present invention (hereinafter sometimes referred to as "the antiglare layer of the present invention"), any known antiglare layer can be employed without limitation. It is generally formed as a layer in which inorganic or organic particles serving as an antiglare agent are dispersed in a resin.

[0122] The anti-glare layer of the present invention is not particularly limited. For example, it can be formed using an anti-glare layer-forming material comprising a resin, particles, and a thixotropy-imparting agent. The particles and thixotropy-imparting agent aggregate to form convex portions on the surface of the anti-glare layer of the present invention. This configuration allows the anti-glare layer to exhibit excellent display properties, achieving both anti-glare properties and preventing white blur. Furthermore, while the anti-glare layer is formed by agglomeration of particles, the formation of protrusions on the surface of the anti-glare layer, which can cause appearance defects, can be prevented, thereby improving the product yield.

[0123] Examples of the resin include thermosetting resins and ionizing radiation curable resins that are cured by ultraviolet rays or light. Commercially available thermosetting resins, ultraviolet curable resins, and the like can also be used as the resin.

[0124] As the above-mentioned thermosetting resin and ultraviolet curing resin, for example, a curable compound having at least one of an acrylate group and a methacrylate group that is cured by heat, light (ultraviolet rays, etc.), or electron beams, can be used. Examples thereof include oligomers or prepolymers such as acrylates or methacrylates of polyfunctional compounds such as silicone resins, polyester resins, polyether resins, epoxy resins, urethane resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, and polyols. These can be used alone or in combination of two or more.

[0125] For example, the above-mentioned resin may also use a reactive diluent having at least one of an acrylate group and a methacrylate group. For example, the above-mentioned reactive diluent may be a reactive diluent described in Japanese Patent Application Laid-Open No. 2008-88309, including, for example, monofunctional acrylates, monofunctional methacrylates, multifunctional acrylates, multifunctional methacrylates, etc. As the above-mentioned reactive diluent, preferred are trifunctional or higher-functional acrylates and trifunctional or higher-functional methacrylates. This is because they can improve the hardness of the anti-glare layer of the present invention. Examples of the above-mentioned reactive diluent include butanediol glyceryl ether diacrylate, isocyanuric acid acrylate, isocyanuric acid methacrylate, etc. These may be used alone or in combination of two or more.

[0126] The resin preferably includes a urethane acrylate resin, and more preferably a copolymer of a curable urethane acrylate resin and a multifunctional acrylate (for example, pentaerythritol triacrylate).

[0127] The main functions of the particles used to form the anti-glare layer of the present invention are to impart anti-glare properties to the surface of the anti-glare layer to be formed by forming a concave-convex shape, and to control the haze value of the anti-glare layer. The haze value of the anti-glare layer can be designed by controlling the refractive index difference between the particles and the resin. Examples of the particles include inorganic particles and organic particles. There are no particular limitations on the inorganic particles, and examples include silicon oxide particles, titanium oxide particles, aluminum oxide particles, zinc oxide particles, tin oxide particles, zirconium oxide particles, calcium carbonate particles, barium sulfate particles, talc particles, kaolin particles, and calcium sulfate particles. There are no particular limitations on the organic particles, and examples include polymethyl methacrylate resin powder (PMMA particles), silicone resin powder, polystyrene resin powder, polycarbonate resin powder, acrylic styrene resin powder, benzoguanamine resin powder, melamine resin powder, polyolefin resin powder, polyester resin powder, polyamide resin powder, polyimide resin powder, and polyvinyl fluoride resin powder. These inorganic particles and organic particles can be used alone or in combination of two or more.

[0128] The weight average particle size (D) of the above-mentioned particles is preferably in the range of 2.5μm to 10μm. By making the weight average particle size of the particles within the above-mentioned range, for example, the anti-glare property can be made more excellent and white blur can be prevented. The weight average particle size of the above-mentioned particles is more preferably in the range of 3μm to 7μm. It should be noted that the weight average particle size of the above-mentioned particles can be measured by, for example, the Coulter counting method. For example, a particle size distribution measuring device using a pore resistance method (trade name: Coulter counter, manufactured by Beckman Coulter) is used to measure the resistance of the electrolyte equivalent to the volume of the particles when the particles pass through the above-mentioned pores, thereby measuring the number and volume of the above-mentioned particles and calculating the weight average particle size.

[0129] The shape of the above-mentioned particles is not particularly limited. For example, they can be roughly spherical in the form of beads, or they can be irregularly shaped particles such as powder. Preferably, they are roughly spherical particles, more preferably, they are roughly spherical particles with an aspect ratio of less than 1.5, and most preferably, they are spherical particles.

[0130] The proportion of the particles in the anti-glare layer of the present invention is preferably in the range of 0.2 to 12 parts by weight, more preferably in the range of 0.5 to 12 parts by weight, and even more preferably in the range of 1 to 7 parts by weight, relative to 100 parts by weight of the resin. By setting the proportion within the above range, for example, the anti-glare properties are further improved and white blur can be prevented.

[0131] The anti-glare layer of the present invention may contain a thixotropy-imparting agent. By including the thixotropy-imparting agent, the agglomerated state of the particles can be easily controlled. Examples of thixotropy-imparting agents used to form the anti-glare layer of the present invention include organoclays, oxidized polyolefins, and modified ureas.

[0132] In order to improve the affinity with the resin, the organoclay is preferably an organic clay. Examples of organoclays include layered organoclays. The organoclays can be prepared by themselves or commercially available. Examples of the commercially available products include: Lucentite SAN, Lucentite STN, Lucentite SEN, Lucentite SPN, Somasif ME-100, Somasif MAE, Somasif MTE, Somasif MEE, and Somasif MPE (trade names, all manufactured by Co-op Chemical Co., Ltd.); ESBEN, ESBEN C, ESBEN E, SBEN W, ESBEN P, ESBEN WX, ESBEN N-400, ESBEN NX, ESBEN NX80, ESBEN NO12S, ESBEN NEZ, ESBEN NO12, ESBEN NE, ESBEN NZ, and ESBEN NZ70; ORGANITE, ORGANITE D, and ORGANITE T (trade names, all manufactured by HOJUN Co., Ltd.); KUNIPIA F, KUNIPIA G, and KUNIPIA G4 (trade names, all manufactured by Kunimine Industries Co., Ltd.); and TIXOGEL. VZ, Kraton HT, Kraton 40 (trade names, all manufactured by Rockwood Additives), etc.

[0133] The oxidized polyolefin may be prepared in-house or a commercial product may be used. Examples of the commercial product include Disparlon 4200-20 (trade name, manufactured by Kusumoto Chemicals Co., Ltd.) and Flownon SA300 (trade name, manufactured by Kyoeisha Chemicals Co., Ltd.).

[0134] The modified urea is a reaction product of an isocyanate monomer or an adduct thereof with an organic amine. The modified urea can be prepared in-house or a commercially available product can be used. Examples of commercially available products include BYK 410 (manufactured by BYK Chemie).

[0135] The thixotropy-imparting agents may be used alone or in combination of two or more.

[0136] The height of the roughness average line of the anti-glare layer of the present invention from the above-mentioned convex portion is preferably less than 0.4 times the thickness of the anti-glare layer. More preferably, it is in the range of greater than or equal to 0.01 times and less than 0.4 times, and further preferably in the range of greater than or equal to 0.01 times and less than 0.3 times. If it is within this range, it is possible to appropriately prevent protrusions that become appearance defects from being formed on the convex portion. The anti-glare layer of the present invention can be less prone to appearance defects by having a convex portion of such a height. Here, the height from the above-mentioned average line can be measured, for example, by the method described in Japanese Patent Application Laid-Open No. 2017-138620.

[0137] The ratio of the thixotropy-imparting agent in the anti-glare layer of the present invention is preferably in the range of 0.1 to 5 parts by weight, more preferably in the range of 0.2 to 4 parts by weight, relative to 100 parts by weight of the resin.

[0138] The thickness (d') of the anti-glare layer of the present invention is not particularly limited, and is preferably in the range of 2 μm to 12 μm. By making the thickness (d') of the anti-glare layer within the above range, for example, the optical laminate of the present invention can be prevented from curling, and problems such as poor transportability and reduced productivity can be avoided. In addition, when the thickness (d') is within the above range, as described above, the weight average particle size (D) of the particles is preferably in the range of 2.5 μm to 10 μm. By making the thickness (d') of the anti-glare layer of the present invention and the weight average particle size (D) of the particles be the above combination, the anti-glare property can be made more excellent. The thickness (d') of the anti-glare layer of the present invention is more preferably in the range of 2 μm to 10 μm, and further preferably in the range of 3 μm to 8 μm.

[0139] The relationship between the thickness (d') of the anti-glare layer of the present invention and the weight average particle size (D) of the particles is preferably within the range of 0.3 ≤ D / d' ≤ 0.9. This relationship can further improve anti-glare properties, prevent white blur, and produce an anti-glare layer without appearance defects.

[0140] The haze value (H') of the anti-glare layer of the present invention is not particularly limited. From the perspective of effectively reducing color shift and interference unevenness in OLED displays, it is preferably 5% or greater, more preferably 10% or greater, even more preferably 15% or greater, and particularly preferably 20% or greater. Furthermore, from the perspective of suppressing image blur in OLED displays and displaying high-definition images, the haze value of the anti-glare layer of the present invention is preferably 80% or less, more preferably 70% or less, even more preferably 60% or less, and particularly preferably 50% or less.

[0141] The haze value of the anti-glare layer of the present invention can be measured by the method specified in JIS K7136 and can be designed by controlling the type and thickness of the anti-glare layer and the refractive index difference between the particles and the resin.

[0142] The anti-glare layer of the present invention forms convex portions on the surface of the anti-glare layer of the present invention by agglomerating the particles and the thixotropy-imparting agent. Within the agglomerated portions forming the convex portions, the particles are present in a plurality of aggregates in the direction of the surface of the anti-glare layer of the present invention. As a result, the convex portions have a flat shape. The anti-glare layer of the present invention, having convex portions of such a shape, can prevent white blur while maintaining anti-glare properties and is less susceptible to appearance defects.

[0143] The surface shape of the anti-glare layer of the present invention can be arbitrarily designed by controlling the coagulation state of the particles contained in the anti-glare layer forming material. The coagulation state of the particles can be controlled, for example, by the material of the particles (e.g., the chemical modification state of the particle surface, affinity for solvents or resins, etc.), the type and combination of the resin (binder) or solvent, etc. The coagulation state of the particles can be controlled by the thixotropy imparting agent contained in the anti-glare layer forming material of the present invention. As a result, the coagulation state of the particles can be made as described above, and the convex portion can be made into a gentle shape.

[0144] In the anti-glare layer of the present invention, it is preferred that the number of appearance defects with a maximum diameter of 200 μm or more is less per 1 m 2 More preferably, there is no such appearance defect.

[0145] In the concavo-convex shape of the anti-glare layer surface of the present invention, the average tilt angle θa (°) is preferably in the range of 0.1 to 5.0, more preferably in the range of 0.3 to 4.5, further preferably in the range of 1.0 to 4.0, and particularly preferably in the range of 1.6 to 4.0. Here, the average tilt angle θa is a value defined by the following mathematical formula (1). The above-mentioned average tilt angle θa is, for example, a value measured by the method described in Japanese Patent Application Laid-Open No. 2017-138620.

[0146] Average tilt angle θa = tan -1 Δa (1)

[0147] In the above mathematical formula (1), Δa is the value obtained by dividing the sum of the differences (height h) between the apex of adjacent peaks and the lowest point of valleys (h1+h2+h3...+hn) by the reference length L of the roughness curve specified in JIS B0601 (1994 edition), as shown in the following mathematical formula (2). The above roughness curve is a curve obtained by removing surface fluctuation components longer than a specified wavelength from a cross-sectional curve using a phase difference compensation high-frequency filter. The cross-sectional curve refers to the profile that appears at the cut when the target surface is cut along a plane perpendicular to the target surface.

[0148] Δa=(h1+h2+h3···+hn) / L (2)

[0149] When θa is within the above range, the anti-glare property is more excellent and white blurring can be prevented.

[0150] When forming the anti-glare layer of the present invention, the prepared anti-glare layer-forming material (coating solution) preferably exhibits thixotropy, and the Ti value specified below is preferably in the range of 1.3 to 3.5, more preferably in the range of 1.3 to 2.8.

[0151] Ti value = β1 / β2

[0152] Here, β1 is the viscosity measured using Rheo stress 6000 manufactured by HAAKE at a shear rate of 20 (1 / s), and β2 is the viscosity measured using Rheo stress 6000 manufactured by HAAKE at a shear rate of 200 (1 / s).

[0153] When the Ti value is less than 1.3, appearance defects are likely to occur, and the anti-glare and white haze properties are deteriorated. On the other hand, when the Ti value is greater than 3.5, the particles are less likely to aggregate and tend to be dispersed.

[0154] The method for producing the anti-glare layer of the present invention is not particularly limited and can be produced by any method. For example, the anti-glare layer can be produced by preparing an anti-glare layer-forming material (coating solution) containing the resin, the particles, the thixotropy-imparting agent, and a solvent, applying the anti-glare layer-forming material (coating solution) to form a coating film, and curing the coating film to form the anti-glare layer. Alternatively, a transfer method using a mold or a method of imparting a concave-convex shape by sandblasting, embossing rollers, or other suitable methods can be used.

[0155] The above-mentioned solvent is not particularly limited, and various solvents can be used, either alone or in combination. The optimal solvent type and solvent ratio vary depending on the composition of the above-mentioned resin, the type and content of the above-mentioned particles and the above-mentioned thixotropy-imparting agent. The solvent is not particularly limited, and examples thereof include: alcohols such as methanol, ethanol, isopropyl alcohol, butanol, and 2-methoxyethanol; ketones such as acetone, methyl ethyl ketone, methyl isobutyl ketone, and cyclopentanone; esters such as methyl acetate, ethyl acetate, and butyl acetate; ethers such as diisopropyl ether and propylene glycol monomethyl ether; glycols such as ethylene glycol and propylene glycol; cellosolves such as ethyl cellosolve and butyl cellosolve; aliphatic hydrocarbons such as hexane, heptane, and octane; and aromatic hydrocarbons such as benzene, toluene, and xylene.

[0156] By appropriately selecting the above-mentioned solvent, the thixotropy-imparting agent can be used to make the anti-glare layer-forming material (coating solution) exhibit good thixotropy. For example, when using organoclay, toluene and xylene can be suitably used alone or in combination. For example, when using oxidized polyolefin, methyl ethyl ketone, ethyl acetate, and propylene glycol monomethyl ether can be suitably used alone or in combination. For example, when using modified urea, butyl acetate and methyl isobutyl ketone can be suitably used alone or in combination.

[0157] Various leveling agents can be added to the anti-glare layer forming material. As the above-mentioned leveling agent, in order to prevent uneven coating (uniformity of the coating surface), for example, a fluorine-containing or silicone-based leveling agent can be used. The leveling agent can be appropriately selected according to the situation where the surface of the anti-glare layer of the present invention requires antifouling properties, or the situation where an anti-reflection layer or a layer containing an interlayer filler is formed on the anti-glare layer. For example, by containing the thixotropy imparting agent, the coating liquid can exhibit thixotropy, and is therefore not prone to uneven coating. Therefore, for example, there is an advantage of expanding the selection range of the above-mentioned leveling agent.

[0158] The amount of the leveling agent blended is, for example, 5 parts by weight or less, and preferably within a range of 0.01 to 5 parts by weight, relative to 100 parts by weight of the resin.

[0159] The anti-glare layer forming material may be added with pigments, fillers, dispersants, plasticizers, ultraviolet absorbers, surfactants, antifouling agents, antioxidants, etc. as needed within a range that does not impair performance. These additives may be used alone or in combination of two or more.

[0160] As the anti-glare layer-forming material, a conventionally known photopolymerization initiator described in, for example, JP-A-2008-88309 can be used.

[0161] Examples of a method for applying the anti-glare layer-forming material include a coating method such as a jet coating method, a die coating method, a spin coating method, a spray coating method, a gravure coating method, a roll coating method, and a bar coating method.

[0162] The anti-glare layer-forming material is applied to form a coating film, and the coating film is cured. The coating film is preferably dried before curing. The drying method may be, for example, natural drying, air drying, heat drying, or a combination thereof.

[0163] The curing means of the coating of the anti-glare layer forming material is not particularly limited, but ultraviolet curing is preferred. The irradiation amount of the energy ray source is preferably 50 mJ / cm2 in terms of cumulative exposure at an ultraviolet wavelength of 365 nm. 2 ~500mJ / cm 2 If the irradiation dose is 50mJ / cm 2 If the irradiation dose is 500mJ / cm 2 The following can prevent the formed anti-glare layer from being colored.

[0164] The anti-glare layer of the present invention can be formed by the above operation. It should be noted that the anti-glare layer can also be formed by a manufacturing method other than the above method. Although the hardness of the anti-glare layer of the present invention is affected by the thickness of the layer, it is preferably 2H or more in pencil hardness.

[0165] The anti-glare layer of the present invention may have a multilayer structure in which two or more layers are stacked.

[0166] The anti-reflection layer described above can also be disposed on the anti-glare layer of the present invention. For example, one of the main reasons for reducing the visual recognition of OLED displays is the reflection of light at the interface between air and the anti-glare layer. The anti-reflection layer reduces surface reflection. It should be noted that the anti-glare layer and the anti-reflection layer of the present invention can each be a multilayer structure obtained by laminating two or more layers.

[0167] (Optical laminate)

[0168] In the optical layered body of the present invention, [Rf1 / Rp1] is preferably 0.3 or less, more preferably 0.25 or less, further preferably 0.2 or less, further preferably 0.15 or less, and particularly preferably 0.1 or less. The smaller [Rf1 / Rp1] is, the more interference unevenness can be suppressed.

[0169] In the optical layered body of the present invention, [Rf2 / Rp2] is preferably 0.12 or less, more preferably 0.1 or less, further preferably 0.05 or less, further preferably 0.03 or less, and particularly preferably 0.01 or less. The smaller [Rf2 / Rp2] is, the more interference unevenness can be suppressed.

[0170] The sum of [Rf1 / Rp1] and [Rf2 / Rp2] is preferably 0.42 or less, more preferably 0.4 or less, further preferably 0.3 or less, further preferably 0.2 or less, and particularly preferably 0.1 or less. The smaller the sum, the more interference unevenness can be suppressed.

[0171] In the optical layered body of the present invention, the value of (d×H)×{[Rf1 / Rp1]+[Rf2 / Rp2]} is preferably 20,000 or less, more preferably 15,000 or less, and even more preferably 10,000 or less. This configuration can suppress white blur and image blur caused by the OLED display device of the present invention, resulting in excellent visual recognition.

[0172] In the optical layered body of the present invention, S1 is preferably 15% or more, more preferably 20% or more, further preferably 30% or more, further preferably 40% or more, and particularly preferably 50% or more. The larger S1 is, the more interference unevenness can be suppressed.

[0173] In the optical layered body of the present invention, S2 is preferably 15% or more, more preferably 20% or more, further preferably 30% or more, further preferably 40% or more, and particularly preferably 50% or more. The larger the S2, the more interference unevenness can be suppressed.

[0174] In the optical layered body of the present invention, the total of S1 and S2 is preferably 30% or more, more preferably 40% or more, further preferably 60% or more, further preferably 80% or more, and particularly preferably 100% or more. The greater the total, the more interference unevenness can be suppressed.

[0175] The optical laminate of the present invention preferably has a structure comprising a substrate layer and an adhesive layer of the present invention on the side opposite to the visual recognition side of the anti-glare layer of the present invention, and more preferably has a structure comprising these layers in this order. The substrate layer can be a resin layer of the present invention or a glass layer of the present invention.

[0176] In one embodiment of the optical layered body of the present invention (for example, Figure 4In the optical laminate in the OLED display device of the present invention shown in FIG, a color filter is arranged on the visual recognition side of the OLED element, and when the distance (d) between the adhesive layer of the present invention and the above-mentioned color filter is 700 μm or less, the distance between the adhesive layer of the present invention (especially the adhesive layer having light scattering properties) and the above-mentioned color filter is set to d [μm], and the haze value of the adhesive layer of the present invention (especially the adhesive layer having light scattering properties) is set to H [%], the value of d×H is preferably 70,000 or less, more preferably 60,000 or less, and further preferably 50,000 or less. When the value of d×H is 700,000 or less, image blurring is less likely to occur. The value of d×H is, for example, 100 or more, and may be 1000 or more, 10,000 or more, or 20,000 or more. In this case, H is preferably 20 or more.

[0177] In one embodiment of the optical layered body of the present invention (for example, Figure 4 In the optical laminate in the OLED display device of the present invention shown in FIG, when the thickness of the adhesive layer of the present invention (particularly the adhesive layer having light scattering properties) is denoted as T [μm] and the haze value of the adhesive layer of the present invention (particularly the adhesive layer having light scattering properties) is denoted as H [%], the value of T×H is preferably 400 or greater, more preferably 600 or greater, even more preferably 800 or greater, even more preferably 1000 or greater, and particularly preferably 1500 or greater. When the value of T×H is 400 or less, image blurring is less likely to occur. The value of T×H is, for example, 10,000 or less, but may also be 8,000 or less, 6,000 or less, or 4,000 or less.

[0178] In one embodiment of the optical layered body of the present invention (for example, Figure 5 In the optical laminate in the OLED display device of the present invention shown in FIG, as the optical element of the present invention, it is preferred that the optical laminate further comprises the adhesive layer of the present invention, the substrate layer, and the hard coating layer of the present invention on the visual recognition side of the glass layer of the present invention, and more preferably comprises these layers in this order. The substrate layer may be the resin layer of the present invention or the glass layer of the present invention.

[0179] In one embodiment of the optical layered body of the present invention (for example, Figure 5 In the optical laminate in the OLED display device of the present invention shown in FIG, where the indentation modulus of the adhesive layer of the present invention is denoted as Ea and the tensile storage modulus of the resin layer of the present invention is denoted as Er, the absolute value of Ea-Er is preferably 1 GPa or less, more preferably 0.9 GPa or less, further preferably 0.7 GPa or less, and particularly preferably 0.5 GPa or less. When the absolute value is 1 GPa or less, impact resistance is further improved.

[0180] In one embodiment of the optical layered body of the present invention (for example, Figure 5 In the optical laminate in the OLED display device of the present invention shown in FIG, the tensile storage modulus Er of the resin layer of the present invention is preferably 4 GPa or more, more preferably 4.3 GPa or more, and further preferably 4.6 GPa or more. When the tensile storage modulus Er is 4 GPa or more, the impact resistance is further improved. The tensile storage modulus Er is, for example, 50 GPa or less, and may be 30 GPa or less, or 10 GPa or less. The tensile storage modulus Er can be measured according to JIS K7161.

[0181] In one embodiment of the optical layered body of the present invention (for example, Figure 6 In the optical laminate in the OLED display device of the present invention shown in FIG, it is preferable to have a structure in which an intermediate layer (compatible layer) is formed between the transparent polyimide layer and the hard coating layer of the present invention. By forming the intermediate layer, the adhesion between the transparent polyimide layer and the hard coating layer of the present invention is improved. The intermediate layer is a layer formed by the composition (coating agent) for forming the hard coating layer of the present invention penetrating into the transparent polyimide layer. That is, the intermediate layer is a portion of the transparent polyimide layer where the hard coating component of the present invention is present.

[0182] The ratio (P1) of the shear strength of the intermediate layer to the shear strength of the hard coat layer of the present invention is preferably 0.25 or less, more preferably 0.23, and even more preferably 0.21 or less. The ratio (P1) is, for example, 0.02 or more, and may be 0.05 or more, or 0.08 or more.

[0183] In one embodiment of the optical layered body of the present invention (for example, Figure 6 In the optical laminate in the OLED display device of the present invention shown in FIG, the ratio (P2) of the shear fracture strength of the transparent polyimide layer to the shear fracture strength of the hard coat layer of the present invention is preferably 0.65 or greater, more preferably 0.70 or greater, further preferably 0.80 or greater, and particularly preferably 0.90 or greater. The ratio (P2) is, for example, 1.50 or less, and may be 1.30 or less, or 1.10 or less.

[0184] The difference (P2-P1) between the ratio (P1) and the ratio (P2) is preferably 0.6 or more, more preferably 0.70 or more, and may be 0.80 or more. The difference (P2-P1) is, for example, 1.5 or less, 1.2 or less, or 0.9 or less.

[0185] In one embodiment of the optical layered body of the present invention (for example, Figure 6In the optical laminate in the OLED display device of the present invention shown in FIG, it is preferable that the transparent polyimide layer further has an adhesive layer on the side opposite to the hard coat layer of the present invention.

[0186] (Method for producing an optical laminate)

[0187] The method for manufacturing the optical laminate of the present invention is not particularly limited, and can be manufactured by sequentially stacking the adhesive layer, adhesive layer, resin layer, glass layer, hard coating layer, anti-reflection layer, anti-glare layer, intermediate layer (compatible layer), impact absorbing layer, etc., which constitute the optical element of the present invention on the visual recognition side of the OLED display panel of the present invention. In addition, it can be manufactured by pre-making a laminate constituting the optical laminate of the present invention and laminating it on the visual recognition side of the OLED display panel of the present invention. In the case of pre-making a laminate constituting the optical laminate of the present invention, it can be a laminate constituting the entirety of the optical laminate of the present invention, or a laminate constituting a part of the optical laminate of the present invention can be separately laminated on the visual recognition side of the OLED display panel of the present invention.

[0188] The layers constituting the optical element of the present invention or the laminate thereof may be protected with a release liner or a surface protective film until use.

[0189] (Release liner)

[0190] When the optical element of the present invention includes an adhesive layer, a release liner may be provided on the surface (adhesive surface) of the adhesive layer before use. The release liner serves as a protective material for the adhesive layer and is removed when the optical element is attached to an adherend. It should be noted that the release liner does not constitute the optical element of the present invention and does not need to be provided.

[0191] As the above-mentioned release liner, conventional release paper etc. can be used, without particular limitation, for example, a substrate having a release treatment layer, a low-adhesive substrate comprising a fluorine-containing polymer, a low-adhesive substrate comprising a non-polar polymer etc. can be cited. As the substrate having the above-mentioned release treatment layer, for example, plastic films, papers etc. that have been surface-treated with release treatment agents such as silicones, long-chain alkyls, fluorine-containing types, and molybdenum sulfide can be cited. As the above-mentioned fluorine-containing polymer in the low-adhesive substrate comprising a fluorine-containing polymer, for example, polytetrafluoroethylene, polychlorotrifluoroethylene, polyvinyl fluoride, polyvinylidene fluoride, tetrafluoroethylene-hexafluoropropylene copolymer, chlorofluoroethylene-vinylidene fluoride copolymer etc. can be cited. In addition, as the above-mentioned non-polar polymer, for example, olefin resins (such as polyethylene, polypropylene etc.) can be cited. It should be noted that the release liner can be formed by a known or conventional method. In addition, the thickness of the release liner is not particularly limited.

[0192] (Surface protection film)

[0193] The outermost surface (the outermost surface on the visual recognition side) of the optical layered body of the present invention can be protected by a surface protective film. The surface protective film can be applied by the consumer. It should be noted that the surface protective film does not constitute the optical element of the present invention and does not need to be provided.

[0194] As the above-mentioned surface protection film, a known or customary surface protection film can be used, but is not particularly limited. For example, a surface protection film having an adhesive layer on the surface of a plastic film can be used. As the above-mentioned plastic film, for example, a plastic film formed by plastic materials such as polyester (polyethylene terephthalate, polyethylene naphthalate, etc.), polyolefin (polyethylene, polypropylene, cyclic polyolefin, etc.), polystyrene, acrylic resin, polycarbonate, epoxy resin, fluorine-containing resin, silicone resin, diacetate resin, triacetate resin, polyarylate, polyvinyl chloride, polysulfone, polyethersulfone, polyetherimide, polyimide, and polyamide can be listed. As the above-mentioned adhesive layer, for example, an adhesive layer formed by one or more of the known or customary adhesives such as acrylic adhesive, natural rubber adhesive, synthetic rubber adhesive, ethylene-vinyl acetate copolymer adhesive, ethylene-(methyl)acrylate copolymer adhesive, styrene-isoprene block copolymer adhesive, and styrene-butadiene block copolymer adhesive can be listed. The adhesive layer may contain various additives (e.g., antistatic agents, slip agents, etc.). It should be noted that the plastic film and the adhesive layer may each have a single layer structure or a multilayer structure. In addition, the thickness of the surface protective film is not particularly limited and can be appropriately selected.

[0195] (OLED display device of the present invention)

[0196] Hereinafter, one embodiment of an OLED display device in which the optical laminate of the present invention is laminated on the viewing side of an OLED display panel will be described with reference to the drawings. However, the present invention is not limited to this embodiment. Figure 2 This is a schematic cross-sectional view showing one embodiment of the basic configuration of an OLED display device in which the optical laminate of the present invention is laminated.

[0197] like Figure 2 As shown, the OLED display device 200 is on the visual recognition side ( Figure 2 The OLED display panel 100 is not particularly limited, and may be, for example, Figure 1 The OLED display panel 100 has the same structure as described in .

[0198] exist Figure 2In the OLED display device 200, 26 to 29 are layers constituting the optical laminate 20, 26 represents a pressure-sensitive adhesive layer or adhesive layer, 27 represents a resin layer, 28 represents an anti-glare layer, and 29 represents an anti-reflection layer. The optical laminate 20 having the anti-glare layer 28 and the anti-reflection layer 29 suppresses interference unevenness and white blurring caused by the OLED display panel 100, and the OLED display device 200 has excellent visual recognition.

[0199] exist Figure 3 In the OLED display device 300, 31 to 39 are layers constituting the optical laminate 30, 31 represents an adhesive layer or a bonding agent layer, 32 represents a resin layer, a glass layer or an impact-absorbing layer, 33 represents a hard coating layer or an anti-glare layer, 34 represents an adhesive layer or an adhesive layer, 35 represents a resin layer, a glass layer or an impact-absorbing layer, 36 represents an adhesive layer or an adhesive layer, 37 represents a resin layer, a glass layer or an impact-absorbing layer, 38 represents an anti-glare layer, and 39 represents an anti-reflection layer. Figure 3 The stacked structure of the optical stack 30 shown is not limited to this embodiment, and may be Figure 3 The optical layered structure of the optical layered body 30 shown may include other layers constituting the optical element of the present invention inserted between any of the layers, or may not exist. Figure 3 Any layer of the stacked structure of the optical stack 30 shown.

[0200] As a preferred embodiment of the present invention, Figure 3 In FIG, 31 is an adhesive layer, 32 is a resin layer, 33 is a hard coating layer, 34 is an adhesive layer, 35 is a glass layer, 36 is an adhesive layer, 37 is a resin layer, 38 is an anti-glare layer, and 39 is an anti-reflection layer. At least one of the adhesive layers 31, 34, and 36 may be an adhesive layer having light scattering properties. Figure 4 FIG shows an OLED display device 400 of this embodiment. Figure 4 In the figure, 41 to 49 are layers constituting the optical laminate 40, 41 is an adhesive layer, 42 is a resin layer, 43 is a hard coat layer, 44 is an adhesive layer, 45 is a glass layer, 46 is an adhesive layer having light scattering properties, 47 is a resin layer, 48 is an anti-glare layer, and 49 is an anti-reflection layer. The optical laminate 40 having the anti-glare layer 48 and the anti-reflection layer 49 suppresses interference unevenness and white blurring caused by the OLED display panel 100, and the OLED display device 400 has excellent visual recognition.

[0201] As another preferred embodiment of the present invention, Figure 3In the figure, the OLED display panel 100 is provided with a color filter on the visual recognition side, 31 is an adhesive layer, 32 is a resin layer, 33 is a hard coating layer, 34 is an adhesive layer, 35 is a glass layer, 36 is an adhesive layer, 37 is a resin layer, 38 is an anti-glare layer, and 39 is an anti-reflection layer. A hard coating layer may be provided between the resin layer 37 and the anti-glare layer 38. At least one of the adhesive layers 31, 34, and 36 is an adhesive layer having light scattering properties, and the distance d (μm) between the adhesive layer having light scattering properties and the color filter is 700 μm or less. Since the distance d between the adhesive layer having light scattering properties and the color filter is 700 μm or less, even if a light scattering layer is stacked to suppress color shift and interference unevenness caused by the OLED display device 300, image blur is not easily generated, and visual recognition is excellent. From the perspective of more effectively reducing image blurring in OLED display devices caused by stacking a light scattering layer, the distance between the adhesive layer having light scattering properties and the color filter is more preferably 600 μm or less, further preferably 500 μm or less, and most preferably the adhesive layer having light scattering properties is in direct contact with the color filter. Figure 5 (a) and Figure 5 (b) shows OLED display devices 500A and 500B of this embodiment. Figure 5 In (a), 51A to 59A are layers constituting the optical laminate 50A, 51A is an adhesive layer, 52A is a resin layer, 53A is a hard coating layer, 54A is an adhesive layer, 55A is a glass layer, 56A is an adhesive layer having light scattering properties, 57A is a resin layer, 58A is an anti-glare layer, and 59A is an anti-reflection layer. 15A is disposed on the visual recognition side (on the Figure 5 In the color filter (upper side in (a), the distance d (μm) between the adhesive layer 46A having light scattering properties and the color filter 15A is 700 μm or less. Figure 5 In (b), 51B to 59B are layers constituting the optical laminate 50B, 51B is an adhesive layer having light scattering properties, 52B is a resin layer, 53B is a hard coating layer, 54B is an adhesive layer, 55B is a glass layer, 56B is an adhesive layer, 57B is a resin layer, 58B is an anti-glare layer, and 59B is an anti-reflection layer. 15B is disposed on the visual recognition side of the OLED display panel 500B (on the Figure 5 (b) shows the color filter on the upper side. The light-scattering adhesive layer 51B is in direct contact with the color filter 15B. That is, the distance between the light-scattering adhesive layer 51B and the color filter 15B is 0 μm. This effectively suppresses color shift and interference unevenness caused by the OLED display device 500B.

[0202] It should be noted that in Figure 5(a) and Figure 5 In the OLED display devices 500A and 500B shown in (b), a hard coating layer may be provided between the anti-glare layer 58A and the anti-reflection layer 59A, or between the anti-glare layer 58B and the anti-reflection layer 59B.

[0203] As another preferred embodiment of the present invention, Figure 3 In the figure, 31 is an adhesive layer, 32 is a resin layer, 33 is absent, 34 is an adhesive layer, 35 is a glass layer, 36 is an adhesive layer, 37 is a resin layer, 38 is an anti-glare layer, and 39 is an anti-reflection layer. Alternatively, Figure 3 In FIG, 31 is an adhesive layer, 32 is a resin layer, 33 is a hard coating layer, 34 is an adhesive layer, 35 is a glass layer, 36 is an adhesive layer, 37 is a resin layer, 38 is an anti-glare layer, and 39 is an anti-reflection layer. At least one of the adhesive layers 31, 34, and 36 may be an adhesive layer having light scattering properties. Figure 6 (a) and Figure 6 (b) shows OLED display devices 600A and 600B of this embodiment. Figure 6 In (a), 61A, 62A, 64A to 69A are layers constituting the optical laminate 60A, 61A is an adhesive layer, 62A is a resin layer, 64A is an adhesive layer, 65A is a glass layer, 66A is an adhesive layer, 67A is a resin layer, 68A is an anti-glare layer, and 69A is an anti-reflection layer. At least one of the adhesive layers 61A, 64A, and 66A is an adhesive layer having light scattering properties. In addition, Figure 6 In (b), 61B to 69B are layers constituting the optical laminate 60B, 61B is an adhesive layer, 62B is a resin layer, 63B is a hard coat layer, 64B is an adhesive layer, 65B is a glass layer, 66B is an adhesive layer, 67B is a resin layer, 68B is an anti-glare layer, and 69B is an anti-reflection layer. At least one of the adhesive layers 61B, 64B, and 66B is an adhesive layer having light scattering properties. Figure 6 In (a), the resin layer 62A and the glass layer 65A are bonded together by the adhesive layer 64A, or Figure 6 In (b), the glass layer 65B and the resin layer 67B are bonded together by an adhesive layer 66B, thereby imparting excellent impact resistance to each of the optical laminates 60A and 60B, even when the optical laminates 60A and 60B do not include a polarizing plate. While the glass layer has excellent impact resistance, it is a raw material that is easily broken and has low bendability. By bonding the glass layer and the resin layer together with an adhesive layer, flexibility and bendability are improved, enabling the OLED display devices 600A and 600B to be used in flexible and foldable devices.

[0204] It should be noted that in Figure 6 (a) and Figure 6In the OLED display devices 600A and 600B shown in (b), a hard coat layer may be provided between the anti-glare layer 68A and the anti-reflection layer 69A, or between the anti-glare layer 68B and the anti-reflection layer 69B.

[0205] As another preferred embodiment of the present invention, Figure 3 In the figure, 31 is an adhesive layer, 32 is a resin layer, 33 is a hard coating layer, 34 is an adhesive layer, 35, 36, and 37 are resin layers, 38 is an anti-glare layer, and 39 is an anti-reflection layer. Either or both of the resin layers 32 and 37 are transparent polyimide layers. At least one of the adhesive layers 31 and 34 is an adhesive layer having light scattering properties. Figure 7 FIG shows an OLED display device 700 of this embodiment. Figure 7 In FIG. 7 , 71 to 74 and 77 to 79 are layers constituting the optical laminate 70, 71 is an adhesive layer, 72 is a transparent polyimide layer, 73 is a hard coat layer, 74 is an adhesive layer, 77 is a resin layer, 78 is an anti-glare layer, and 79 is an anti-reflection layer. At least one of the adhesive layers 71 and 74 is an adhesive layer having light scattering properties. Figure 7 In the embodiment, the optical laminate 70 includes a transparent polyimide layer 72 and a hard coating layer 73, thereby imparting excellent impact resistance even when the optical laminate 70 does not include a polarizing plate. In addition, in this embodiment, the optical laminate 70 does not include a glass layer. The glass layer is a raw material that exhibits high hardness and excellent impact resistance, but has poor operability and is difficult to use in large displays used in PCs, tablet computers, etc. By laminating the transparent polyimide layer and the hard coating layer, it is possible to achieve high hardness equivalent to that of the glass layer, and the operability is also excellent, so it can be used in large displays used in PCs, tablet computers, etc.

[0206] It should be noted that in Figure 7 In the OLED display device 700 shown, a hard coating layer may be provided between the anti-glare layer 78 and the anti-reflection layer 79 .

[0207] exist Figure 7 In the illustrated embodiment, an intermediate layer (compatibility layer) (not shown) is preferably formed between the transparent polyimide layer 72 and the hard coating layer 73. Forming the intermediate layer (compatibility layer) between the transparent polyimide layer 72 and the hard coating layer 73 improves the adhesion between the transparent polyimide layer 72 and the hard coating layer 73. In this case, the shear fracture strength between the transparent polyimide layer 72 and the hard coating layer 73 is preferably 20 MPa or greater.

[0208] Example

[0209] The present invention is described in more detail with reference to the following examples, but the present invention is not limited by these examples.

[0210] Example 1

[0211] <OLED display device>

[0212] The optical film laminated on the visual recognition side of a 4K OLED display (model: EPS 269Q 015A) manufactured by JOLED was peeled off to prepare an OLED display device.

[0213] <Manufacture of anti-glare layer>

[0214] 50 parts by weight of pentaerythritol triacrylate (trade name "Viscoat #300", manufactured by Osaka Organic Chemical Co., Ltd.) as a binder resin, 50 parts by weight of urethane acrylate prepolymer (trade name "UA-53H-80BK", manufactured by Shin-Nakamura Chemical Co., Ltd.), 3.5 parts by weight of polysiloxane particles (trade name "Tospearl 130", manufactured by Momentive Performance Materials Japan, weight average particle diameter: 3 μm, refractive index: 1.42), 2 parts by weight of synthetic saponite (trade name "Sumecton SAN", manufactured by KUNIMINE Industries Co., Ltd.) as an organic clay, 3 parts by weight of a photoinitiator (trade name "Omnirad 907", manufactured by IGM Resins Itaila Srl), and 0.2 parts by weight of a leveling agent (trade name "PC 4100", manufactured by DIC Corporation, solid content 10% by weight) were mixed and diluted with a toluene / cyclopentanone (CPN) mixed solvent (weight ratio 70 / 30) to prepare an anti-glare layer-forming composition having a solid content concentration of 35% by weight. It should be noted that the organic clay was diluted with toluene to a solid content of 6% by weight before use. The above anti-glare layer-forming composition was coated on a triacetyl cellulose film (trade name "KC4UA", manufactured by Konica Minolta Co., Ltd., thickness: 40 μm) as a transparent substrate using a comma coater (registered trademark), heated at 80 °C for 1 minute, and then irradiated with ultraviolet rays having an accumulated light quantity of 300 mJ / cm 2 to obtain an anti-glare film having an anti-glare layer (thickness: 6 μm) formed on the transparent substrate.

[0215] <Formation of undercoat layer>

[0216] Next, the heated anti-glare film was introduced into a roll-to-roll sputtering film-forming apparatus, and the pressure in the film-forming chamber was reduced to 1×10 -4Pa. Next, while conveying the anti-glare film, argon and oxygen were introduced at a volume ratio of 100:10, the surface temperature of the film-forming roller was set to -8°C, and a 1.5nm thick ITO layer (undercoat) was formed on the anti-glare layer of the anti-glare film by sputtering. In forming the undercoat, an ITO target containing indium oxide and tin oxide at a weight ratio of 90:10 was used as the target material. In addition, when forming the film by sputtering, the power supply was set to an MFAC power supply, the discharge power was set to 2.5kW, and the pressure in the film-forming chamber was set to 0.2Pa.

[0217] <Formation of Antireflection Layer>

[0218] After forming the primer layer, a roll-to-roll sputtering system was used to deposit the anti-glare film onto the primer layer. A first layer of 12nm thick Nb2O5 (refractive index: 2.32), a second layer of 29nm thick SiO2 (refractive index: 1.46), a third layer of 107nm thick Nb2O5, and a fourth layer of 81nm thick SiO2 were sequentially deposited on the primer layer. This resulted in a four-layer antireflection layer (first, second, third, and fourth layers) formed on the primer layer. During the deposition of each of the first, second, third, and fourth layers, the deposition roll surface temperature was set to -8°C, the power supply was set to an MFAC power source, and the pressure within the deposition chamber was set to 0.7 Pa. For the deposition of the first layer, a Nb target was used, argon and oxygen were introduced at a volume ratio of 100:5, and the discharge power was set to 10.5kW. For the second layer, a Si target was used, argon and oxygen were introduced at a volume ratio of 100:30, and the discharge power was set to 14 kW. For the third layer, a Nb target was used, argon and oxygen were introduced at a volume ratio of 100:13, and the discharge power was set to 22 kW. For the fourth layer, a Si target was used, argon and oxygen were introduced at a volume ratio of 100:30, and the discharge power was set to 12 kW.

[0219] <Formation of Antifouling Layer>

[0220] A 12 nm thick antifouling layer was formed on the antireflection layer by vacuum deposition using a dried and solidified alkoxysilane compound containing a perfluoropolyether skeleton (trade name "SHIN-ETSU SUBELYN KY1903-1," manufactured by Shin-Etsu Chemical Co., Ltd.) as a vapor deposition source. The heating temperature of the vapor deposition source was set to 260°C. This resulted in an optical laminate with an antifouling layer comprising a triacetylcellulose film, an antiglare layer, a primer layer, an antireflection layer, and an antifouling layer.

[0221] <Production of OLED Display Device with Optical Laminate>

[0222] The optical laminate was laminated on the OLED display device via an acrylic pressure-sensitive adhesive layer in such a manner that the antifouling layer of the optical laminate was on the visual recognition side, thereby producing an OLED display device with the optical laminate.

[0223] Example 2

[0224] <Production of Anti-Glare Layer>

[0225] 100 parts by weight of urethane acrylate (trade name "LUXYDIR 17-806", manufactured by DIC Corporation) as a binder resin, 14 parts by weight of organosilicon fine particles (trade name "Sylophobic", manufactured by Fuji Silicone Chemical Co., Ltd.), 2.5 parts by weight of synthetic smectite (trade name "Sumecton SAN", manufactured by Kunimine Industries, Ltd.) as an organoclay, 5 parts by weight of a photopolymerization initiator (trade name "Omnirad 184", manufactured by IGM Resins Itaila Srl), and 0.5 parts by weight of a leveling agent (trade name "MEGAFACE F-556", manufactured by DIC Corporation) were mixed and diluted with toluene to prepare a composition for forming an anti-glare layer having a solid content concentration of 42% by weight. It should be noted that the organoclay was diluted with toluene to a solid content of 6% by weight before use. The anti-glare layer-forming composition was applied onto a triacetyl cellulose film (trade name "KC4UA", manufactured by Konica Minolta Co., Ltd., thickness: 40 μm) as a transparent substrate using a comma coater (Comma Coater (registered trademark)). The film was heated at 80° C. for 1 minute and then irradiated with a high-pressure mercury lamp at a cumulative light intensity of 300 mJ / cm 2 The anti-glare film was obtained by forming an anti-glare layer (thickness: 7 μm) on a transparent substrate.

[0226] <Production of OLED Display Device with Optical Laminate>

[0227] An optical layered body and an OLED display device with the optical layered body were produced in the same manner as in Example 1 except that the anti-glare film was used.

[0228] Example 3

[0229] <Production of Anti-Glare Layer>

[0230] 100 parts by weight of urethane acrylate (trade name "LUXYDIR 17-806", manufactured by DIC Corporation) as a binder resin, 13.8 parts by weight of styrene fine particles (trade name "SX-350H", manufactured by Sekisui Chemical Co., Ltd.), 2.5 parts by weight of synthetic smectite (trade name "Sumecton SAN", manufactured by Kunimine Industries, Ltd.) as an organoclay, 5 parts by weight of a photopolymerization initiator (trade name "Omnirad 907", manufactured by IGM Resins Itaila Srl), and 0.5 parts by weight of a leveling agent (trade name "MEGAFACE F-556", manufactured by DIC Corporation) were mixed and diluted with toluene to prepare a composition for forming an anti-glare layer having a solid content concentration of 32% by weight. It should be noted that the organoclay was diluted with toluene to a solid content of 6% by weight before use. The anti-glare layer-forming composition was applied onto a triacetyl cellulose film (trade name "KC4UA", manufactured by Konica Minolta Co., Ltd., thickness: 40 μm) as a transparent substrate using a comma coater (Comma Coater (registered trademark)). The film was heated at 80° C. for 1 minute and then irradiated with a high-pressure mercury lamp at a cumulative light intensity of 300 mJ / cm 2 The anti-glare layer (thickness: 5 μm) was formed on the transparent substrate to obtain an optical laminate.

[0231] <Production of OLED Display Device with Optical Laminate>

[0232] An optical layered body and an OLED display device with the optical layered body were produced in the same manner as in Example 1 except that the anti-glare film was used.

[0233] Example 4

[0234] An optical laminate and an OLED display device with the optical laminate were produced in the same manner as in Example 1 except that the thickness of the third layer in the antireflection layer formation step was changed to 90 nm.

[0235] Example 5

[0236] An optical laminate and an OLED display device with the optical laminate were produced in the same manner as in Example 1 except that the thickness of the third layer in the antireflection layer formation step was changed to 70 nm.

[0237] Example 6

[0238] An optical laminate and an OLED display device with the optical laminate were produced in the same manner as in Example 1 except that the thickness of the third layer in the antireflection layer formation step was changed to 50 nm.

[0239] Comparative Example 1

[0240] <Production of Hard-Coated Film>

[0241] A UV-curable multifunctional acrylic resin composition (trade name "Z-850-50H-D", manufactured by Aica Industries, solid content concentration: 44% by weight) was mixed with 100 parts by weight of a photopolymerization initiator (trade name "Omnirad 2959", manufactured by IGM Resins Itaila Srl) and 0.05 parts by weight of a leveling agent (trade name "LE-303", manufactured by Kyoeisha Chemical Co., Ltd.) to obtain a mixed solution. Subsequently, methyl isobutyl ketone was added to the obtained mixed solution to obtain a hard coat layer forming composition having a solid content concentration of 40% by weight. Subsequently, the above-mentioned hard coat layer forming composition was applied to one surface of a PET film (trade name "50U48", manufactured by Toray Industries, Ltd., thickness: 50 μm) serving as a transparent film substrate to form a coating film. Subsequently, the coating film was dried by heating it at a temperature of 80°C for 60 seconds and then cured by ultraviolet irradiation. When irradiating with ultraviolet light, a high-pressure mercury lamp was used as the light source, ultraviolet light with a wavelength of 365 nm was used, and the cumulative light intensity was set to 300 mJ / cm 2 Thus, a hard coating layer with a thickness of 3 μm was formed on the PET film.

[0242] <Production of OLED Display Device with Optical Laminate>

[0243] An optical laminate and an OLED display device with an optical laminate were produced by following the same procedures as in Example 1 except that the anti-glare film was changed to the above-mentioned film with a hard coating layer, and a primer layer, an anti-reflection layer, and an anti-fouling layer were formed in sequence on the hard coating surface of the above-mentioned film with a hard coating layer.

[0244] Comparative Example 2

[0245] An optical laminate and an OLED display device with the optical laminate were produced in the same manner as in Example 1 except that the surface treatment of the antiglare layer, the formation of the primer layer, the formation of the antireflection layer, and the formation of the antifouling layer were not performed.

[0246] Comparative Example 3

[0247] An optical laminate and an OLED display device with the optical laminate were produced in the same manner as in Comparative Example 1 except that the surface treatment of the hard coat layer, the formation of the primer layer, the formation of the antireflection layer, and the formation of the antifouling layer were not performed.

[0248] <Evaluation>

[0249] The following evaluations were performed on the OLED display devices with optical laminates produced in Examples and Comparative Examples. The results are shown in Table 1.

[0250] (1) Haze value (H')

[0251] The anti-glare films produced in the Examples and Comparative Examples (for Comparative Examples 1 and 3, the transparent substrates) were measured using a haze meter (trade name "HN-150," manufactured by Murakami Color Science Laboratory Co., Ltd.) using the method specified in JIS K7136. The haze value H' of the anti-glare layer can be determined by subtracting the haze value of the transparent substrate from the haze value of the anti-glare film (i.e., the sum of the haze values ​​of the transparent substrate and the anti-glare layer). The haze value of the transparent substrate was less than 1%.

[0252] (2) Scattering efficiency S1, S2

[0253] Using a spectrophotometer manufactured by Hitachi High-Technologies Corporation, the transmittance at each wavelength from 380 nm to 780 nm, measured with the optical layered body having an anti-glare layer in contact with an integrating sphere, was defined as Tn1; and the transmittance at each wavelength from 380 nm to 780 nm, measured with the optical layered body having an anti-glare layer positioned 145 mm from the integrating sphere, was defined as Tn2. The scattering efficiency at each wavelength was calculated as Tn1-Tn2. Next, the reflectance at each wavelength from 380 nm to 780 nm of the surface of a JOLED Co., Ltd. 4K OLED display (Model No.: EPS 269Q 015A) from which the optical film laminated on the viewing side was peeled off, was measured using a spectrophotometer "CM-2600d" manufactured by Konica Minolta Co., Ltd., and the first peak wavelength WL1 (nm) and the second peak wavelength WL2 (nm) were calculated. The first peak is the maximum value in the wavelength range of 380nm to 455nm, and the second peak is the maximum value in the wavelength range of 460nm to 530nm. The scattering efficiencies at the first peak wavelength WL1 (nm) and the second peak wavelength WL2 (nm) are calculated as S1 and S2, respectively.

[0254] (3) Rf1, Rf2, Rp1, Rp2

[0255] The reflectivity of the optical laminate at wavelengths from 380 nm to 780 nm was measured using a spectrophotometer manufactured by Hitachi High-Technologies Corporation. Next, the reflectivity of the surface of the OLED display device from which the optical film was removed, after the optical film laminated on the viewing side of a 4K OLED display manufactured by JOLED Corporation (Model No.: EPS 269Q 015A) was removed, was measured using a spectrophotometer "CM-2600d" manufactured by Konica Minolta Co., Ltd., at wavelengths from 380 nm to 780 nm. The first peak wavelength WL1 (nm) and the second peak wavelength WL2 (nm) were calculated. The first peak is the maximum value within the wavelength range of 380 nm to 455 nm, and the second peak is the maximum value within the wavelength range of 460 nm to 530 nm. The reflectances of the OLED display at the first peak wavelength WL1 (nm) and the second peak wavelength WL2 (nm) were denoted as Rp1 and Rp2, respectively. The reflectances of the optical laminate at the first peak wavelength WL1 (nm) and the second peak wavelength WL2 (nm) were calculated as Rf1 and Rf2, respectively. It should be noted that the reflectances of the optical laminates in Examples 1 to 6 and Comparative Example 1 correspond to the reflectances of the antireflection layer.

[0256] (4) Uneven interference

[0257] The OLED display device with an optical laminate obtained in the examples and comparative examples was set to a non-lit state. When a three-wavelength fluorescent lamp was lit at a distance of 30 cm from the OLED display device with the optical laminate, the interference unevenness on the surface of the OLED display device with the optical laminate was visually observed and judged according to the following criteria.

[0258] ◎: No visually discernible interference unevenness

[0259] ○: Interference unevenness is barely perceptible

[0260] ×: Interference unevenness can be clearly visually recognized

[0261] (5) White blur

[0262] The OLED display device with an optical laminate obtained in the examples and comparative examples was set to a non-lit state. When a three-wavelength fluorescent lamp was lit at a distance of 30 cm from the OLED display device with the optical laminate, the white blur on the surface of the OLED display device with the optical laminate was visually observed and judged according to the following criteria.

[0263] ◎: No white blur can be seen

[0264] ○: White blur is barely perceptible

[0265] △: White blur can be slightly seen

[0266] ×: White blur can be clearly visually recognized

[0267]

[0268] Hereinafter, modifications of the present invention will be described.

[0269] [Supplementary Note 1] An optical laminate for an OLED display device, the optical laminate for an OLED display device being used for an OLED display device in which only an optical element having a polarization degree of 95% or less is laminated on the visual recognition side of an OLED element, wherein the optical element has at least an antireflection layer and an antiglare layer, and in a reflectance spectrum of the OLED display device in a state where the optical laminate for an OLED display device is not laminated, the maximum reflectance within a wavelength range of 380 nm to 455 nm is defined as Rp1, and the maximum reflectance within a wavelength range of 380 nm to 455 nm is defined as Rp2. When the maximum reflectivity within the range of 460 nm to 530 nm is set to Rp2, the reflectivity of the anti-reflection layer at the wavelength WL1 of Rp1 is set to Rf1, the reflectivity of the anti-reflection layer at the wavelength WL2 of Rp2 is set to Rf2, and the scattering efficiency of the anti-glare layer at the wavelength WL1 is set to S1, and the scattering efficiency of the anti-glare layer at the wavelength WL2 is set to S2, the value of (S1+S2) / {[Rf1 / Rp1]+[Rf2 / Rp2]} is greater than 100.

[0270] [Supplementary Note 2] The optical laminate for an OLED display device according to Supplementary Note 1, wherein the antireflection layer has a water contact angle of 100° or greater.

[0271] [Supplementary Note 3] The optical laminate for an OLED display device according to Supplementary Note 1 or 2, wherein the antireflection layer has a water contact angle of 90° or greater after an eraser test.

[0272] [Supplementary Note 4] The optical laminate for an OLED display device according to any one of Supplementary Notes 1 to 3, wherein the antireflection layer is composed of an inorganic substance.

[0273] [Supplementary Note 5] The optical laminate for an OLED display device according to any one of Supplementary Notes 1 to 4, wherein the anti-glare layer has a haze value H′ of 5% or more.

[0274] [Supplementary Note 6] The optical laminate for an OLED display device according to any one of Supplementary Notes 1 to 5, wherein the anti-glare layer has a thickness of 2 μm to 10 μm.

[0275] [Supplementary Note 7] The optical laminate for an OLED display device according to any one of Supplementary Notes 1 to 6, further comprising a base material layer and a pressure-sensitive adhesive layer on the side of the anti-glare layer opposite to the visual recognition side.

[0276] [Supplementary Note 8] The optical laminate for an OLED display device according to Supplementary Note 7, wherein the haze value H of the pressure-sensitive adhesive layer is 20% to 90%.

[0277] Description of labels

[0278] 100 OLED display panels

[0279] 10R red OLED layer

[0280] 10G green OLED layer

[0281] 10B blue OLED layer

[0282] 11a Transparent electrode (cathode)

[0283] 11b back electrode (anode)

[0284] 12R red OLED element

[0285] 12G green OLED component

[0286] 12B blue OLED element

[0287] 13 substrates

[0288] 14 TFT layer

[0289] 15 color filters

[0290] 15R red coloring layer

[0291] 15G green coloring layer

[0292] 15B blue coloring layer

[0293] 16 black matrix layers

[0294] W external light

[0295] G reflected light

[0296] C1 first light path (direct light)

[0297] C2 second optical path (reflected light)

[0298] 17 bonding layer

[0299] 200 OLED display device

[0300] 20 Optical laminate

[0301] 26 Adhesive layer or adhesive layer

[0302] 27 resin layer

[0303] 28 anti-glare layers

[0304] 29 Anti-reflection layer

[0305] 300 OLED display device

[0306] 30 Optical laminate

[0307] 31 adhesive layer or adhesive layer

[0308] 32 resin layer, glass layer or impact absorbing layer

[0309] 33 hard coating

[0310] 34 adhesive layer or adhesive layer

[0311] 35 resin layer, glass layer or impact absorbing layer

[0312] 36 Adhesive layer or adhesive layer

[0313] 37 resin layer, glass layer or impact absorbing layer

[0314] 38 anti-glare layers

[0315] 39 Anti-reflection layer

[0316] 400 OLED display devices

[0317] 40 optical laminate

[0318] 41 adhesive layer

[0319] 42 resin layers

[0320] 43 hard coating

[0321] 44 adhesive layer

[0322] 45 glass layers

[0323] 46 Adhesive layer with light scattering properties

[0324] 47 resin layer

[0325] 48 anti-glare layers

[0326] 49 anti-reflection layer

[0327] 500A OLED display device

[0328] 50A optical laminate

[0329] 51A adhesive layer

[0330] 52A resin layer

[0331] 53A hard coating

[0332] 54A adhesive layer

[0333] 55A glass layer

[0334] 56A Adhesive layer with light scattering properties

[0335] 57A resin layer

[0336] 58A anti-glare layer

[0337] 59A anti-reflection layer

[0338] 15A color filter

[0339] 500B OLED display device

[0340] 50B optical laminate

[0341] 51B Adhesive layer with light scattering properties

[0342] 52B resin layer

[0343] 53B hard coating

[0344] 54B adhesive layer

[0345] 55B glass layer

[0346] 56B adhesive layer

[0347] 57B resin layer

[0348] 58B anti-glare layer

[0349] 59B anti-reflection layer

[0350] 15B color filter

[0351] 600A OLED display device

[0352] 60A optical laminate

[0353] 61A adhesive layer

[0354] 62A resin layer

[0355] 64A adhesive layer

[0356] 65A glass layer

[0357] 66A adhesive layer

[0358] 67A resin layer

[0359] 68A anti-glare layer

[0360] 69A anti-reflection layer

[0361] 600B OLED display device

[0362] 60B optical laminate

[0363] 61B adhesive layer

[0364] 62B resin layer

[0365] 63B hard coating

[0366] 64B adhesive layer

[0367] 65B glass layer

[0368] 66B adhesive layer

[0369] 67B resin layer

[0370] 68B anti-glare layer

[0371] 69B anti-reflection layer

[0372] 700 OLED display device

[0373] 70 optical laminate

[0374] 71 adhesive layer

[0375] 72 transparent polyimide layer

[0376] 73 hard coating

[0377] 74 adhesive layer

[0378] 77 resin layer

[0379] 78 anti-glare layer

[0380] 79 anti-reflection layer

Claims

1. An optical laminate for an OLED display device, wherein the optical laminate is used for an OLED display device in which only an optical element having a polarization degree of 95% or less is laminated on a visual recognition side of an OLED element, wherein: The optical element has at least an anti-reflection layer and an anti-glare layer, In the reflectance spectrum of the OLED display device in a state where the optical laminate for the OLED display device is not laminated, the maximum reflectance in the wavelength range of 380 nm to 455 nm is set to Rp1, and the maximum reflectance in the wavelength range of 460 nm to 530 nm is set to Rp2, the reflectance of the antireflection layer at the wavelength WL1 of Rp1 is set to Rf1, the reflectance of the antireflection layer at the wavelength WL2 of Rp2 is set to Rf2, and the scattering efficiency of the anti-glare layer at the wavelength WL1 is set to S1, and the scattering efficiency of the anti-glare layer at the wavelength WL2 is set to S2, The value of (S1+S2) / {[Rf1 / Rp1]+[Rf2 / Rp2]} is 100 or more.

2. The optical laminate for an OLED display device according to claim 1, wherein The water contact angle of the anti-reflection layer is greater than 100°.

3. The optical laminate for an OLED display device according to claim 1 or 2, wherein: The water contact angle of the anti-reflection layer after an eraser test is greater than 90°.

4. The optical laminate for an OLED display device according to claim 1 or 2, wherein: The anti-reflection layer is made of inorganic matter.

5. The optical laminate for an OLED display device according to claim 1 or 2, wherein: The anti-glare layer has a haze value H' of 5% or more.

6. The optical laminate for an OLED display device according to claim 1 or 2, wherein: The anti-glare layer has a thickness of 2 μm to 10 μm.

7. The optical laminate for an OLED display device according to claim 1 or 2, wherein: The anti-glare layer has a base material layer and a pressure-sensitive adhesive layer on the side opposite to the visual recognition side.

8. The optical laminate for an OLED display device according to claim 7, wherein: The haze value H of the adhesive layer is 20% to 90%.

Images